Website speed optimization
A slow website loses users before they even have a chance to explore the offer, open a catalog, or fill out a form. This problem is especially noticeable on mobile devices, where the connection is unstable and the device's performance is lower than that of a desktop computer. Optimizing your website's speed helps reduce page load delays, improve interface responsiveness, and eliminate technical issues that interfere with the website's performance.
At Seo-Gen, our work begins with diagnostics. We check Google PageSpeed Insights, Core Web Vitals, page load speed, server response, and resource loading sequence. We then determine which changes will yield results specifically for this website. The goal is not limited to trying to achieve a pretty test result. After implementing the changes, we check the mobile and desktop versions, forms, analytics, catalog, shopping cart, and other operational elements.
Why is website speed important for business and SEO?
Users evaluate speed before page content. If a catalog takes a long time to open, a button responds slowly, or the first screen appears in parts, the likelihood of further interaction decreases. For an online store, this could mean fewer product views and checkouts, and for a service website, fewer clicks to forms or contacts.
Faster website loading is especially noticeable on mobile devices. This is where large images, large amounts of JavaScript, unstable networks, and poorly thought-out resource loading order become apparent. Technical optimization reduces the impact of these factors and makes key user scenarios more predictable.
User experience and conversion
A fast page displays the main content earlier and responds more quickly to visitor actions. Users don't have to wait for a menu to open, a form to appear, or a heavy banner to load. For a commercial website, this directly impacts the quality of the user experience, especially when comparing multiple search results.
The relationship between speed and conversion can't be described with a single, universal percentage. Results depend on the niche, device, traffic source, and the site's condition prior to optimization. Therefore, after optimization, it's useful to compare technical metrics with analytics: pages per session, form usage, cart usage, and other significant actions.
Site speed and Google rankings
Google takes into account the quality of page interactions, including Core Web Vitals, but good speed alone doesn't guarantee high rankings. The search engine also requires relevant content, correct intent, a clear structure, internal links, proper indexing, and other quality signals.
Website speed optimization addresses the technical aspect of the task. If competing pages have comparable content and authority, the technical state of the page can impact its overall competitiveness. Therefore, it makes sense to consider speed alongside other technical SEO efforts, rather than in isolation.
Website Speed Optimization: What's Included?
Website speed optimization services include checking the entire chain that affects page loading. On one project, the main latency is caused by the images above the fold, on another, the browser takes a long time to process JavaScript, and on a third, several seconds are lost even before the HTML is received from the server. Therefore, the same set of settings for different websites rarely yields comparable results.
We examine the frontend, server-side, CMS operation, database, third-party connections, and real-world user scenarios. After diagnostics, tasks are prioritized. Issues that most significantly impact site performance and don't require risky changes to the site's logic are addressed first.
Technical performance audit
The audit reveals at what stage the delay occurs and which pages require immediate attention. We check the homepage, key landing pages, categories, product or service cards, and other templates that receive organic or advertising traffic. We also compare the mobile and desktop versions separately, as the results often differ between them.
Google PageSpeed Insights, Lighthouse, browser data, and other diagnostic tools are used for analysis. We check Time to First Byte, First Contentful Paint, Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift, critical resources, third-party scripts, and caching. This data set helps us find the root cause, rather than fixing individual warnings without understanding their impact.
What do we record before starting work?
Before making changes, we save the original metrics for key pages. These measurements include LCP, INP, CLS, TTFB, FCP, Speed Index, and other metrics that help assess the health of a specific site. We also record issues identified by Lighthouse and check which resources take the longest to load or block page rendering.
Baseline data is needed for re-validation. After implementation, you can see which metrics actually changed and where the root cause remains. This approach is especially useful for projects with a complex frontend, numerous third-party services, or an unstable server, where a single change can impact several loading stages at once.
Frontend optimization
The frontend directly impacts how much data the browser must download, parse, and process before displaying a page. We check HTML, CSS, JavaScript, images, video, fonts, the DOM structure, and the order in which resources are loaded. Particular attention is paid to the first screen, as its elements are directly related to the user's perception of speed.
During the work, we reduce unnecessary code, move non-critical resources, reduce image size, and eliminate blocking connections. If a page is overloaded with libraries, widgets, or animations, we assess the necessity of each element. Edits are implemented in a manner that preserves the design, analytics, and functionality of the site.
Server optimization
Even a well-built frontend will load slowly if the server takes a long time to generate a response. Therefore, we separately check server response time, cache operation, database, backend, web server configuration, and infrastructure limitations. For dynamic websites, this stage often has a significant impact on overall speed.
Depending on the project, we use server-side caching, Brotli or Gzip, CDN, database tuning, and slow query optimization. We also check whether the current hosting is adequate for the site's load. Moving to a different server isn't always necessary, so we first identify the specific cause of the delay.
I don't consider a 100 PageSpeed score as a standalone SEO goal. I first look at the actual Core Web Vitals, mobile version, TTFB, and critical load path. Sometimes, an increase from a hypothetical 60 to 90 points reflects a significant improvement, while further pursuit of 100/100 changes almost nothing for the user. The priority remains real bottlenecks, LCP, INP, CLS, and the stable operation of the site after changes.
How does website speed optimization work?
The process is designed so that the results can be verified after implementation. Initial metrics are recorded, then issues are categorized by impact and complexity. After each group of changes, it's possible to determine which adjustments were effective and whether further work is required.
For large projects, optimization is performed in stages. This reduces the risk of conflicts and helps separate quick fixes from more time-consuming architectural tasks.
Measure the initial indicators
We check the main types of pages using Google PageSpeed Insights, Lighthouse, and browser developer tools. If sufficient data is available, we look at Core Web Vitals for real users. We also examine Search Console if access to the project is included in the workflow.
All values are recorded before changes. This creates a point of comparison and helps avoid subjective assessments like "the site seems to have gotten faster". For each issue, we record the technical cause and the page on which it occurs.
Find bottlenecks
After measuring, we analyze the loading chain and determine where the most time is lost. We check the server response, critical resources, images, JavaScript execution, third-party connections, and layout changes.
Issues are grouped by type and impact. This approach helps separate warnings that have little impact on user experience from those that can significantly improve LCP, INP, CLS, or actual page speed.
Create a priority list of edits
Each task is prioritized based on potential impact, implementation complexity, and risk to functionality. Quick and safe changes are usually implemented before deep rework of the architecture or individual components.
The developer and SEO specialist need this list as a unified work plan. It prevents the team from wasting time on minor Lighthouse warnings while the main issue remains on the server or in critical JavaScript.
Implement technical changes
Once approved, the changes are implemented into the code, server configuration, CMS, or infrastructure. Website speed optimization services should include actual technical work, if this is the format agreed upon with the client, rather than simply submitting a general report.
Changes are made taking into account the current project architecture. On sites under active development, it's important not to use temporary solutions that will disappear after the next template or build update.
Retest the site
After implementation, we repeat the lab tests and compare the results with the baseline data. We analyze the same URLs and metrics to ensure the comparison remains valid. If a specific issue persists, we re-examine its origin chain.
Core Web Vitals field metrics don't change instantly, as they reflect accumulated user data. Therefore, technical tests remain the primary verification method immediately after changes, with real-world metrics assessed later.
Check the site after changes
Speedups shouldn't disrupt functionality. After technical fixes, we test forms, menus, filters, shopping cart, authorization, analytics, dynamic blocks, and other scenarios that depend on JavaScript, caching, or server-side logic.
We also preview the site on mobile and desktop devices through the production domain. This monitoring is especially necessary after changing the script loading order, critical CSS, cache, or third-party integrations.
What we actually did
Dental clinic · Kyiv and Chernihiv
+44% clicks from search
A domain with no history and a site on a website builder. We built the semantic core for the services and both cities, reworked the landing pages and built the link profile from zero. In four months: 34.8k clicks, impressions 1.32 → 1.76M, DR 0 → 41.
E-commerce · international
+96% clicks in two months
A catalog of digital 3D models. We clustered the semantics, rebuilt the hub pages and fixed duplicates and indexing errors. Google users 247 → 532, CTR 2.4% → 4%.
Medical center · Ukraine
+68.75% visibility in the first month
Narrow visibility and a small semantic core at the start. Semantics, landing page structure, metadata and internal linking, then gradual link building.
How long does it take to speed up a website?
The timeframe depends on the nature of the issue. Images, caching, or individual blocking resources can sometimes be fixed fairly quickly. Reworking a large JavaScript bundle, a slow backend, or complex online store logic requires a full development and testing cycle.
Before diagnostics, it's more accurate to discuss the scope of tasks rather than promise a universal number of days. After the audit, it's clear which changes can be implemented separately and which require work on the architecture or server.
When a project is active, it's best to perform edits in a staging environment and then test them on the production domain. This reduces the risk of speedups affecting forms, payments, the catalog, or other functions.
How much does website speed optimization cost?
The cost depends on the project's status and the scope of the work. A simple landing page with heavy images and a large online store with a slow database require different amounts of work. Therefore, a fixed price without prior analysis provides little insight into the actual task.
The calculation is influenced by the CMS or tech stack, the number of templates, the state of the frontend, the need for server-side changes, third-party modules, and the number of problematic pages. Website speed optimization can be ordered after an initial URL assessment and determination of the scope of work required.
If only an audit with a task list is required, the scope is calculated separately from the implementation. The full-service format includes diagnostics, technical adjustments, and post-implementation monitoring. This is specified in advance as part of the service.
Why you should order speed optimization from Seo-Gen
Seo-Gen examines performance from both a development and technical SEO perspective. We check how a page loads, which resources are interfering with the initial rendering, what's happening on the server, and how changes impact the real-world user experience.
The work doesn't end with a list of PageSpeed warnings. If the project format includes implementation, changes are made to the code, CMS, or infrastructure, followed by a re-diagnosis and verification of the site's core functions.
For each project, baseline metrics and post-implementation results are preserved. We don't change working site elements for the sake of a few extra Lighthouse points or remove integrations that are essential to the business without assessing the impact.
Answers to your questions
Is it possible to get a 100-point score in Google PageSpeed Insights?
Achieving a 100-point score for individual pages is possible, but this depends on the architecture, functionality, external connections, and test conditions. For a commercial website, maintaining functionality is often more important than a few extra points.
When optimizing, you need to look at LCP, INP, CLS, actual first-screen speed, and interface responsiveness. If you have to disable analytics, forms, or essential features to achieve 100/100, such optimization doesn't solve your business's problem.
Does website speed affect Google rankings?
While speed and Core Web Vitals are technical page quality signals, search rankings are determined by a combination of factors. Even a very fast website is no substitute for relevant content, proper structure, quality links, and alignment with search intent.
Optimization helps remove technical limitations and improve the user experience. In competitive search results, this is a useful part of SEO efforts, but predicting specific ranking gains based solely on PageSpeed changes is inaccurate.
How is PageSpeed Insights different from Core Web Vitals?
PageSpeed Insights is a diagnostic service that displays lab results and available data from real users. Core Web Vitals is a separate set of metrics describing the loading of core content, interface responsiveness, and visual stability.
Core Web Vitals include LCP, INP, and CLS. Therefore, the phrase "improving PageSpeed" usually means addressing several technical indicators and issues the service detects on a specific page.
What to do if PageSpeed is high, but the site still loads slowly?
It's necessary to test real user data, specific page types, server responses, and resource loading sequences. A single lab test doesn't reproduce all devices, networks, and visitor scenarios.
It's also worth comparing the homepage, categories, and other templates. Sometimes a lightweight page is tested with good results, while the commercial section uses more JavaScript, images, and dynamic queries.
Is it possible to speed up a website without changing the design?
Most technical work can be accomplished without noticeably changing the appearance. Optimizing images, CSS, JavaScript, cache, fonts, and the server typically involves the way resources are delivered and processed.
Exceptions arise when the visual concept itself requires very heavy videos, complex animations, or a large number of elements. In such cases, the overall design can be maintained, but individual technical solutions must be reconsidered.
Is it possible to speed up WordPress, OpenCart, or another CMS?
Yes, but there's no one-size-fits-all plugin for every problem. The results are affected by the theme, modules, database, server, number of third-party scripts, and code quality. Two websites running the same CMS may have completely different reasons for poor performance.
First, a diagnostic is performed, after which a set of corrections is determined. Sometimes, fixing image and cache issues is sufficient, while in other cases, optimization of queries, templates, or individual modules is required.
Do I need to re-test my website speed after updating it?
Yes, because new images, scripts, plugins, and template changes can gradually degrade your performance. Re-checking is especially helpful after a redesign, analytics installation, widget additions, or a major CMS update.
For a rapidly developing project, it's best to monitor performance regularly. This helps identify problems immediately after a change, rather than months later, when the source of the slowdown is difficult to pinpoint.
What is more important – mobile or desktop speed?
Both versions need to be tested, as users access the site on different devices. Mobile performance often requires more attention due to less powerful hardware and unstable connection speeds.
The difference between mobile and desktop also helps identify specific issues with the responsive version. For example, a mobile template might load the same heavy images and scripts, even though some resources aren't used at all on a smaller screen.
Website speed optimization begins with accurate diagnostics and ends with post-implementation testing. Images, JavaScript, CSS, fonts, cache, server, and database all impact different stages of loading, so they should be addressed according to priority and based on the specific project's architecture.
To order website acceleration, send your URL to Seo-Gen. We'll check your current performance, identify key bottlenecks, and create a list of technical work based on their impact on speed, Core Web Vitals, and website stability.
We reply within one business day. No newsletters, no “just a reminder” calls.
He will look at the site himself instead of passing it to a manager.
More on: Website speed optimization
How do we check website speed?
A PageSpeed result alone isn't enough to understand the state of a project. The test provides a set of metrics and diagnostic data, but they still need to be linked to specific page elements. For example, a poor LCP could be caused by the above-the-fold image, a slow server, blocking CSS, or a combination of several factors.
Website speed testing includes lab tests, available real user data, and manual browser diagnostics. We compare several types of pages, as the homepage may load quickly, while the catalog or product page may have a completely different issue.
Google PageSpeed Insights and Lighthouse
Google PageSpeed Insights is convenient for initial performance assessments. The service displays Lighthouse lab results and, when sufficient data is available, Chrome User Experience Report information. This report helps you see Core Web Vitals and technical recommendations for a specific URL.
Lighthouse is used for more detailed diagnostics under controlled conditions. It shows blocking resources, the amount of unused code, long tasks, and other technical issues. This data is convenient for developers, as it helps drill down from a general assessment to specific files and page elements.
Laboratory and field data
Lab data is generated during testing under specified conditions. It helps repeat testing after changes and identify specific causes of problems. However, such testing does not reflect the full range of devices, connection speeds, and behavior of real users.
Field data is collected from real visits and better reflects the actual user experience if sufficient information is available for the page. Therefore, the difference between the Lighthouse result and the CrUX data does not in itself indicate an error. These metrics answer different questions and complement each other.
Core Web Vitals
Core Web Vitals describe three important aspects of page interaction: speed of primary content appearance, interface responsiveness, and visual stability. Currently, the core metrics include Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift.
We test them together, as improving one metric doesn't always solve other problems. A page might quickly display a large image but respond slowly to clicks due to heavy JavaScript. Another site might be fast, but elements above the fold will shift as they load.
LCP – main content display speed
Largest Contentful Paint indicates when the largest, most significant element in the visible area of the page appears on the screen. For a typical landing page, this is often a banner, image, large text block, or other element above the fold. A good benchmark is up to 2.5 seconds.
To improve LCP, we check server response speed, image size and format, preload of critical resources, style order, and the presence of render-blocking resources. Lazy loading for the main LCP image sometimes degrades the result, so its use should be evaluated taking into account the element's position.
INP – website response speed
Interaction to Next Paint measures how quickly the interface responds to user actions. This metric takes into account page interactions and the delay until the next visual refresh. A value of less than 200 milliseconds is considered a good benchmark.
High INP is often associated with large amounts of JavaScript, long-running main-thread tasks, or heavy event handlers. To improve performance, reduce unnecessary code, break up lengthy operations, use code splitting, and rethink third-party scripting.
CLS – visual stability
Cumulative Layout Shift measures how much page elements shift unexpectedly during loading. A CLS of less than 0.1 is considered a good benchmark. Users especially notice the issue when a button, text, or form shifts immediately before being clicked.
This can be caused by images without specified dimensions, late-appearing ad units, fonts, and dynamic content. To fix this, reserve space for elements in advance and adjust resource loading. This improves visual stability without changing the page's content.
Additional indicators
In addition to Core Web Vitals, TTFB, FCP, TBT, and Speed Index are useful for diagnostics. Time to First Byte helps evaluate server response speed, and First Contentful Paint shows the moment when the first visible content appears. These metrics provide additional context when investigating the cause of slow loading times.
Total Blocking Time is used in lab tests and helps determine how much the main thread is occupied with heavy tasks. Speed Index measures the visual speed of a page's loading. A single metric rarely provides a complete answer, so decisions are made after analyzing the entire loading sequence.
What most often slows down a website?
The reasons depend on the stack, the age of the project, and the number of changes made since launch. Service websites often feature heavy images, widgets, and analytics scripts. In online stores, these are joined by catalogs, filters, dynamic blocks, and a large number of queries.
The problem usually consists of several factors. Image compression can improve the first-screen experience, but it won't fix a slow backend or overloaded JavaScript. Therefore, it makes sense to order website acceleration along with diagnostics; otherwise, the work turns into a series of random experiments.
Heavy images and videos
Images often take up a significant portion of a page's size. Problems arise when the server serves a photo at its original resolution, even though it appears several times smaller on the screen. Inappropriate formats, a lack of responsive images, and unreasonably high file quality create additional load.
For modern projects, WebP and AVIF, correct image sizes, and srcset for different screen sizes are used. Content below the fold can be loaded using lazy loading. Videos also require separate checking, especially if they automatically begin loading immediately after the page opens.
Redundant CSS and JavaScript
Large CSS and JavaScript files increase download size and browser processing time. Unused JavaScript is especially noticeable, as visitors receive code for functions that aren't used on the current page. A similar situation occurs with large, universal style sheets.
Optimization involves minification, removal of unnecessary code, critical CSS, async, and defer for relevant scripts. Code splitting is used for larger applications. The goal is to ensure that the user receives the resources needed for the current screen and primary interaction sooner.
Fonts and third-party services
Web fonts can delay text rendering if they're loaded without regard to priority and format. To speed things up, WOFF2, preload for truly critical files, and font-display are used. The number of font styles also matters, as each connection adds a new resource.
Analytics, advertising systems, online chats, maps, reviews, and other third-party scripts are checked separately. They can't simply be deleted if they're essential to the business. The goal is to select an appropriate load order and exclude connections that are no longer in use.
Slow server and database
A high TTFB indicates that the problem begins even before the page content is sent to the browser. This could be due to the backend, a large number of database queries, a lack of caching, insufficient server resources, or an incorrect application configuration.
Dynamic projects are analyzed for slow queries, repetitive calculations, and server caching capabilities. A CDN helps serve static resources faster to users in different regions. Brotli or Gzip reduce the size of transferred text files and cut traffic.
CMS, plugins and template
WordPress, OpenCart, and other CMSs don't inherently imply poor performance. Problems typically arise from a combination of themes, modules, third-party libraries, and accumulated changes. A single plugin can include multiple scripts on each page, even though its functionality is only used in a single section.
During the audit, we check which resources the CMS generates and whether they are needed for a specific template. Removing unnecessary resources is done carefully, as aggressive optimization can sometimes break forms, filters, the shopping cart, or administrative functions. After changes, the site is always manually verified.
What do we do to speed up the site?
Website acceleration begins with actions that address the identified issues. There's no universal set of actions: for one project, the server might be a priority, for another, critical CSS, and for a third, images and third-party connections. Therefore, the final list is compiled after a technical diagnosis.
Below are the main areas most often included in website performance optimization services for commercial projects. The specific scope depends on the website architecture, CMS, libraries used, and infrastructure status.
Optimizing images
We check image file size, actual on-screen size, format, and loading order. A large image above the fold can directly impact LCP, while dozens of images below the main area increase the overall page size and create unnecessary network load.
After analysis, modern formats, correct sizes, and loading rules are selected. Maintaining sufficient image quality is crucial, especially for online stores, portfolios, and websites where visuals influence user decisions.
WebP and AVIF
WebP and AVIF help reduce the size of graphics while maintaining comparable visual quality. The format is selected based on browser support, the source image, and how it's used on the page. Automatic conversion without quality checking can produce undesirable results.
After implementation, you need to check the actual file the browser receives, not just the CMS settings. On older projects, there are situations where modern versions of images are created, but the template continues to return the original JPEG or PNG images.
Responsive images
Responsive images help to deliver an image to the user that is appropriately sized for their screen. For this purpose, srcset and other resource selection mechanisms are used. A mobile device doesn't need to download a photo several thousand pixels wide if it's displayed in a small card.
This approach is especially useful for catalogs, news projects, and long pages with numerous images. In addition to saving traffic, it reduces resource loading time, which is noticeable on slow mobile connections.
Lazy loading and LCP element priority
Lazy loading is suitable for images and other content below the fold. The browser loads such a resource later, as the user approaches it. This reduces the amount of data required to initially display the page.
For an LCP element, the opposite approach can be used. If the main image on the first screen is lazily loaded, the browser learns about it too late. Therefore, the priority of critical resources and lazy loading are configured separately for different elements.
Optimizing CSS and JavaScript
We check the amount of CSS and JavaScript, unused CSS, unused JavaScript, blocking resources, and long-running browser tasks. In projects that have been in development for several years, libraries and styles from old components often remain in the build, even though the components themselves have already been removed.
After analysis, minification, critical CSS, async, defer and other suitable methods are applied. In complex applications, code splitting is used to prevent the user from downloading the project's entire JavaScript for a single page. Changes are tested in real scenarios, as an error in the script execution order can disrupt functionality.
Optimizing fonts
We check the number of font families, styles, and font integration methods. Multiple large files that load before the main content can increase the initial display delay and cause visual changes to the text after loading.
We use WOFF2, preload for critical resources and an appropriate font-display value. If necessary, we reduce the number of loaded font styles. After making changes, we test the typography at different resolutions to ensure the performance improvements don't impact the page design.
Setting up caching and compression
Browser caching reduces the number of reloads of static files on subsequent visits. Server-side caching helps deliver finished pages or calculation results faster. The specific scheme depends on the CMS and which data needs to remain dynamic.
Brotli or Gzip are used to transfer text resources. A CDN can reduce latency for users in different regions and lighten the load on the main server. Settings are verified after implementation, as an overly aggressive cache can display outdated data.
Speeding up the server side
If server response times are high, we analyze the backend, database, cache, and infrastructure configuration. We check how long it takes to generate a page and whether there are any slow requests that are repeated every time a user accesses the site.
On complex projects, server optimization can be more effective than frontend changes. If the problem is in the application, changing the hosting without correcting the code will have limited impact. Therefore, infrastructure decisions are made after measurements.
Reducing the number of unnecessary requests
Each additional resource requires processing by the browser and server. A large number of small requests can also slow down a page, especially when some of them are sent to third-party domains. We check which connections are actually required for the current template.
Unused widgets, old analytics systems, and duplicate libraries are removed after approval. For necessary external resources, you can use preconnect and other methods of preparing the connection, if justified by the loading sequence.
Optimizing the DOM and Critical Rendering Path
An excessively large DOM increases the browser's workload when calculating styles, constructing pages, and subsequently making interface changes. This problem is typical for complex website builders, large menus, catalogs, and components that generate a lot of nested markup.
We check the depth and number of elements, the critical rendering path, and the resources the browser must process before the first display. Removing unnecessary markup is done where it truly impacts performance and does not require unnecessary reworking of the working interface.
What results does the client get after website acceleration?
Results are assessed based on changes to specific pages and metrics, rather than by promising a uniform score for every project. After the work, the client receives a faster website, eliminated technical limitations, and a clear comparison of the site's status before and after implementation.
For SEO, this creates a better technical foundation. For users, it reduces delays when opening pages and interacting with the interface. The effect depends on the initial state of the site and the scope of work performed.
Improving technical performance
Optimization can improve LCP, INP, CLS, TTFB, FCP, and other metrics related to interface loading and responsiveness. The exact result depends on the identified causes. If the original issue was a single, heavy image, the solution will be simpler than if the backend is slow.
We compare metrics before and after changes and separately document any remaining limitations. This format helps us understand where further optimization is warranted and where additional work will have minimal impact.
Faster user scenario
Users see the main content faster and can open the menu, navigate to the catalog, or start working with a form sooner. On mobile devices, the effect is usually more noticeable due to network and device performance limitations.
You need to evaluate a specific scenario, not just the moment the page fully loads. If the first screen appears quickly, but the button doesn't respond to clicks for several seconds, the performance issue remains and requires separate JavaScript work.
A better technical foundation for SEO
Speed refers to the technical condition of a page and the user experience. Eliminating significant lags gives a site a more stable foundation for future SEO, but rankings also depend on content, intent, links, indexing, and competition in search results.
Therefore, website speed optimization is often performed in conjunction with a technical audit or before active promotion. First, any limitations that hinder the page's normal operation are eliminated, after which it makes sense to assess further growth potential.
Which websites need speed optimization?
Performance issues affect projects of all types, but the causes vary. An online store is overloaded by its catalog and images, a corporate website may depend on third-party widgets, and a web application may rely on a large JavaScript bundle and API requests.
Ordering website speed optimization is especially useful after a redesign, migration, installation of new modules, or a noticeable deterioration in Core Web Vitals. An audit is also necessary before SEO promotion if technical diagnostics reveal significant delays.
| Site type | Common causes of slowdowns | Main areas of work |
|---|---|---|
| Online store | Catalog, images, filters, large number of queries | Graphics, cache, JavaScript, database |
| Corporate website | Banners, forms, widgets, analytics | First screen, third-party scripts, CSS |
| Landing page | Video, animation, heavy graphics | LCP, images, critical resources |
| Blog and media | Images, advertising, long pages | Lazy loading, CDN, third-party connections |
| Web application | JavaScript, API, dynamic interface | Code splitting, backend, server side |
After the initial review, the task list is refined to reflect the project's current state. The site type helps identify potential problem areas, but final conclusions are only made after the diagnostics.
Online stores
Catalogs contain a large number of images, filters, dynamic components, and server requests. The shopping cart, recommendations, analytics systems, and third-party services create additional load. With a large selection, problems often arise at multiple levels.
Speedup begins with checking categories and product pages, as these are the pages that play a key role in commercial scenarios. Images, the frontend, database queries, and caching are optimized without affecting pricing, stock levels, and the shopping cart.
Corporate and service websites
On such projects, speed is often degraded by large images above the fold, animations, online chats, maps, and analytics systems. Each individual connection may seem insignificant, but together they create a noticeable delay.
Primary landing pages are prioritized because they receive search and advertising traffic. After the changes, inquiry forms, telephony, analytics, and other integrations related to receiving inquiries are separately reviewed.
Landing pages
On landing pages, users typically need to quickly receive an offer and move on to the desired action. Heavy background videos, multiple large images, and complex animations can increase the LCP and delay the appearance of the main content.
During optimization, every resource on the first screen is evaluated. Some effects can be loaded later, images are converted to an appropriate format, and critical styles are prioritized. The visual result after edits must match the original design.
Blogs and content projects
Content websites often have long pages, numerous images, ad blocks, and third-party scripts. As a project grows, the number of connections increases, causing the speed of individual articles to gradually degrade.
For such pages, image optimization, lazy loading, caching, CDN, and external resource monitoring are useful. Layout stability is also checked, as ads and dynamic blocks can increase CLS.
Custom web applications
Web applications require simultaneous frontend and backend analysis. Large JavaScript bundles, numerous API requests, and heavy browser operations can impact loading and INP more than images or simple styles.
Here, web performance optimization services typically include profiling, code splitting, API management, cache management, and server-side logic. Changes should be tailored to the application architecture and released through the normal development and testing cycle.