How to increase website loading speed and why it affects SEO

Why website speed matters for business

A slow website prevents the user from performing a simple action: reading information, choosing a product, submitting a request, paying for an order. This is especially noticeable on mobile devices, where the connection may be unstable.

For business, this translates into tangible losses:

• Higher bounce rate;
• Fewer pages viewed per session;
• Lower conversion rates;
• More expensive advertising;
• Poorer behavioral signals;
• Weaker SEO results;
• Fewer inquiries with the same amount of traffic.

Even if the site ranks in search results, slow loading can eat away the results. You have traffic, but no inquiries. A familiar story.

How to tell if your website is loading slowly

Relying only on personal perception is not enough. Your site may open quickly for you due to cache, a good internet connection, and a modern device. For your customer, the opposite may be true.

It’s better to check speed with several tools:

Which metrics to look at first

Not all metrics are equally useful for business. It’s better to focus on specific metrics rather than just the overall score.

LCP (Largest Contentful Paint) shows how quickly the main visible content loads: banner, large text, product image, main page block. If LCP is high, the user waits a long time for the page to become meaningful.

INP (Interaction to Next Paint) evaluates interface responsiveness. Simply put, how quickly the site reacts to a click, form input, or other action.

CLS (Cumulative Layout Shift) shows how much page elements jump during loading. For example, a user tries to click a button, but a banner suddenly loads and the button moves down.

TTFB (Time to First Byte) shows how quickly the server starts responding. If the server responds slowly, other optimizations may not deliver the desired effect.

What most often slows down a website

The cause is rarely singular. Usually, a site is slowed down by a combination of small issues.

Common sources:

• Heavy images;
• Unoptimized videos;
• Excessive JavaScript;
• Large CSS files;
• Weak hosting;
• No caching;
• Too many third-party scripts;
• Advertising pixels and widgets;
• Unoptimized fonts;
• Outdated CMS or theme;
• Too many plugins;
• Slow database queries.

How to increase website loading speed

It’s better to start with diagnostics rather than chaotic fixes. Otherwise, you could waste time minifying CSS when the real problem is the server or images.

1. Optimize images

Images often weigh more than the rest of the page code combined. Especially on landing pages, e-commerce sites, service websites, and media.

What to do:

• Compress images before uploading
• Use WebP or AVIF where possible
• Don’t upload a 3000px photo when the block only needs 600px
• Enable lazy loading for images below the fold
• Specify image dimensions to prevent layout shifts

2. Remove unnecessary JavaScript

Scripts can block page rendering. Especially if the site has many widgets, chats, analytics tools, advertising pixels, and animations.

Check:

• Which scripts are actually needed?
• Can they be loaded asynchronously?
• Are there duplicate analytics tags?
• Is the chat slowing things down?
• Are libraries being loaded just for one small function?

Often, after cleaning up JS, the site becomes noticeably faster.

3. Configure caching

Cache helps the browser avoid reloading the same files on every visit. This is especially important for returning users.

What can be cached:

• Images
• CSS
• JS
• Fonts
• Static elements
• Dynamic pages via server-side caching

4. Enable data compression

Compression reduces the size of files that the server sends to the browser. Gzip or Brotli are commonly used. This helps load HTML, CSS, and JavaScript faster.

5. Improve server and hosting

Sometimes the problem isn’t the site but the server. Weak hosting, an overloaded plan, a slow database, or incorrect settings can cause high TTFB.

Check:

• Server response time
• CPU and memory load
• PHP version
• Database settings
• Server-side cache performance
• Hosting quality
• Server geography relative to your audience

6. Use a CDN

A CDN delivers content to users from the nearest server. This is especially useful if your audience is distributed across different regions or countries.

A CDN can speed up delivery of:

• Images
• CSS
• JS
• Video
• Static files

7. Optimize fonts

Beautiful fonts can slow down the above-the-fold content. Especially if you load multiple weights, Cyrillic, Latin, and additional styles.

What you can do:

• Keep only necessary font weights
• Use modern font formats
• Configure font-display
• Preload critical fonts
• Avoid loading unnecessary font families

8. Remove heavy plugins and widgets

On WordPress, 1C-Bitrix, and other CMS platforms, plugins are a common source of slowdown. Each new module can add scripts, styles, database queries, and external connections.

What to prioritize first

Not all tasks are equally urgent. It’s better to move from the most noticeable impact to finer adjustments.

How speed affects SEO

Speed alone won’t replace content, structure, and relevance. A fast but empty page won’t rank highly just because it’s fast.

But speed helps SEO in three ways:

• Search robots can crawl the site more easily;
• Users are less likely to leave slow pages;
• The quality of user interaction improves.

Common mistakes when speeding up a website

The most common mistake is chasing a perfect 100 score in PageSpeed at any cost. Sometimes, in pursuit of a high score, sites break their design, disable important scripts, or degrade form functionality.

Other mistakes include:

• Optimizing only the homepage;
• Not testing the mobile version;
• Removing scripts without testing;
• Not making a backup;
• Compressing images to poor quality;
• Forgetting about forms and the shopping cart;
• Not checking the site after CMS updates;
• Not comparing speed with conversion rates.

The goal is not a perfect score in a report, but a fast, user-friendly website that helps users complete desired actions.

Expert commentary

It’s best to view website speed optimization as part of technical SEO and conversion rate optimization. If a page loads faster but the text is weak, the offer is unclear, and the form is inconvenient, the business won’t feel a strong impact.

Good speed optimization starts with the question: what exactly is getting in the user’s way? Sometimes it’s the server. Sometimes it’s a heavy above-the-fold area. Sometimes it’s leftover analytics scripts that were added “temporarily” and forgotten.

Speed isn’t something you improve just once. You need to monitor it after redesigns, new widget implementations, CMS updates, and advertising campaign launches.

Checklist: how to increase website loading speed

Check your site step by step:

• Measure speed in PageSpeed Insights;
• Review Core Web Vitals in Search Console;
• Test the mobile version;
• Find the heaviest images;
• Compress images and convert formats;
• Enable lazy loading;
• Configure caching;
• Enable Gzip or Brotli compression;
• Check server response time;
• Remove unnecessary plugins;
• Defer loading of secondary scripts;
• Optimize fonts;
• Test forms after making changes;
• Compare metrics before and after;
• Set up regular monitoring.

You can start with a short diagnostic: check the homepage, key landing pages, and the mobile version. Often, even the first audit will show what is slowing down the site the most: images, the server, scripts, fonts, or third-party widgets.

Key takeaways

• Loading speed directly affects conversions and user behavior.
• Focus on real metrics: LCP, INP, CLS, not just scores.
• The main issues are images, JS, the server, and lack of caching.
• Start speed optimization with diagnostics, not random fixes.
• Optimizing above-the-fold content provides the fastest impact.
• A slow website can undermine the results of SEO and advertising.
• The goal is not a perfect score but a fast, convenient user experience.