7 Ways to Speed Up Your Website and Improve SEO

Every second of loading time costs you. Google states that increasing load time from 1 to 3 seconds increases the probability of a bounce by 32%. From 1 to 5 seconds? By 90%. And Portent’s research shows that sites loading in 1 second convert 2.5 times better than those loading in 5 seconds.

Since the introduction of Core Web Vitals, site speed is not just a matter of user experience — it’s a direct ranking factor in Google. If your site is slow, you lose twice: search engine rankings and customers who won’t wait. In this article, you will find 7 proven ways to change that.

1. Image optimization — the fastest win

Images typically account for 50–65% of a page’s weight — and they are also the element easiest to optimize with an immediate effect. Unoptimized images not only slow down loading but also generate higher CO₂ emissions (more data = more energy).

What to do:

• Format: Switch from JPEG/PNG to WebP or AVIF. The difference in file size is 25–50% at the same visual quality.
• Compression: TinyPNG, Squoosh.app, or ShortPixel — compress without visible loss of quality. You can also use our free WebP converter.
• Responsive dimensions: The srcset attribute allows you to serve different image sizes depending on the device. A phone doesn’t need a 3000px graphic.

Example: Switching to WebP reduces image size by an average of 30%, which shortens loading time by 1–2 seconds on a typical product page.

2. Caching — speed up for returning visitors

Cache allows the browser to remember static files (CSS, JS, images) so it doesn’t have to download them on every visit. The result? The site loads instantly upon return visits.

What to do:

• Cache-Control headers: Set this in .htaccess or your server configuration. CSS/JS files can be cached for up to a year (you will change the file name upon update anyway).
• WordPress plugins: WP Rocket, LiteSpeed Cache, or W3 Total Cache — setup takes a few minutes, the effect is immediate.
• Server-side cache: Opcache, Redis, or Varnish — for more advanced setups that eliminate repetitive database queries.

A properly configured cache can reduce loading time by 50–70% for returning users (Pingdom data).

3. CDN — serve content from the nearest server

A Content Delivery Network (CDN) distributes copies of your site to servers located around the world. A user in London downloads data from a server in Europe, and a customer in New York — from a server in America. The result: shorter loading times regardless of location.

• Cloudflare — the free plan is sufficient for most sites. Setup takes a few minutes, the effect is immediate.
• Amazon CloudFront / Bunny CDN — for more advanced needs, with more control over configuration and transfer pricing.

A CDN is especially valuable if your site has an international audience — it cuts loading times by up to 40–50% for geographically distant users.

4. Lazy loading — load elements only when needed

Lazy loading ensures that images and other heavy page elements are loaded only when the user scrolls down to them.

How to implement:

• Add the loading="lazy" attribute to <img> tags in your HTML.
• Enable this feature in WordPress plugins, e.g., WP Rocket or Lazy Load by WP Rocket.

With lazy loading, initial page load times can be sped up by 20–30%.

5. Code minification and compression

HTML, CSS, and JavaScript code can contain unnecessary spaces, comments, and repetitions that increase file weight.

Solutions:

• Minify code using tools like CSSNano and UglifyJS, or use our code minification tool.
• Apply GZIP compression to reduce the size of files sent from the server.

Example: Sites that applied HTML minification saved an average of 20% in loading time.

6. Core Web Vitals — the metrics Google measures

Core Web Vitals are three specific metrics Google looks at when evaluating the quality of the user experience on your site:

• LCP (Largest Contentful Paint) — the loading time of the largest visible element (image, heading). Goal: under 2.5 seconds.
• INP (Interaction to Next Paint) — how quickly the page responds to interactions (clicks, typing). Goal: under 200 ms. INP replaced the previous FID in March 2024.
• CLS (Cumulative Layout Shift) — visual stability, i.e., whether page elements “jump” during loading. Goal: under 0.1.

How to improve:

• LCP: Optimize the main image (hero image), set preload for critical resources, speed up server response (TTFB).
• INP: Minimize heavy JavaScript, break up long tasks into smaller ones, avoid blocking the main browser thread.
• CLS: Always specify dimensions for images and video frames (width and height), avoid dynamically injected elements above content.

For a full discussion of technical optimization, see our article: Technical SEO — The Complete Guide.

7. Diagnostic tools — don’t guess, measure

Optimization without measurement is shooting in the dark. The tools below will show you exactly what is slowing down your site:

• Google PageSpeed Insights — detailed Core Web Vitals results with specific recommendations. Measures both lab data and real user data (CrUX).
• GTmetrix — allows testing from different locations and comparing results over time. Great for tracking optimization progress.
• WebPageTest — the most detailed tests: waterfall chart, filmstrip, device comparison. A tool for those who want to understand every millisecond.
• CometWeb Insight — our tool combining performance, SEO, and ecological analysis in a single report with prioritized recommendations.

Summary

Site speed is one of the few SEO investments that yields immediate results — both in Google rankings and conversions. You don’t have to implement all 7 steps at once. Start with a diagnosis (step 7), identify the biggest issues, and fix them one by one. Most often, image optimization and caching provide the biggest gains with the least effort.

Want to expand your knowledge of technical SEO? Read: Technical SEO — The Complete Guide.