Every extra second your site takes to load costs you visitors, rankings and revenue. The good news: most slow websites are slow for a handful of predictable reasons, and fixing them rarely requires a rebuild. Here are 12 proven techniques, roughly ordered by impact — start at the top.
Start by measuring (don't guess)
Before optimizing anything, get a baseline. Run your site through a free speed test so you know your current load time and exactly which resources are the heaviest. Optimizing blind wastes effort on things that don't matter.
1. Optimize your images
Images are the single biggest cause of slow pages. Compress them, resize them to the dimensions they're actually displayed at, and serve modern formats like WebP or AVIF. A 4000px hero image squeezed into a 800px slot is pure waste.
2. Lazy-load below-the-fold media
Don't make the browser download images and videos the user hasn't scrolled to yet. Native lazy-loading (loading="lazy") defers them until they're needed, so the visible content appears faster.
3. Enable compression (Gzip/Brotli)
Text assets — HTML, CSS, JavaScript — compress dramatically. Enabling Brotli or Gzip on your server can cut their size by 70%+ with a single config change.
4. Use browser caching
Tell browsers to store static assets locally so repeat visits don't re-download everything. Set proper Cache-Control headers on images, CSS, JS and fonts.
5. Put a CDN in front of your site
A Content Delivery Network serves your assets from a server physically near each visitor, slashing latency. For a global audience, this is one of the highest-leverage changes you can make.
6. Minify CSS and JavaScript
Strip whitespace, comments and dead code from your assets. Most build tools do this automatically — make sure it's switched on in production.
7. Eliminate render-blocking resources
CSS and JavaScript in the <head> can block your page from painting. Inline critical CSS, and defer or async non-essential scripts so content appears while the rest loads.
8. Reduce third-party scripts
Every analytics tag, chat widget and tracking pixel adds weight and main-thread work. Audit them ruthlessly — remove what you don't use, and load the rest after your content.
9. Optimize your fonts
Web fonts can block rendering and cause layout shift. Preload key fonts, use font-display: swap, and only load the weights and character sets you actually need.
10. Improve server response time
A slow Time To First Byte means the problem starts at your server. Cache database queries, use a faster host, and enable server-side caching so the browser isn't left waiting.
11. Reserve space to stop layout shift
Set explicit width and height (or aspect-ratio) on images, ads and embeds so the layout doesn't jump as they load. This fixes the CLS half of Core Web Vitals and feels far more stable to users.
12. Code-split and ship less JavaScript
Don't send your entire app's code on the first page. Split bundles so each page loads only what it needs. Less JavaScript means faster loading and snappier interactions (better INP).
Re-measure and repeat
After each round of fixes, run the speed test again and check your Core Web Vitals to confirm real improvement. Speed isn't a one-time project — it regresses as you add features, so make checking it a habit.
Want every issue found and prioritized automatically? siteIQ runs a full performance audit and tells you exactly which images, scripts and settings to fix first. Test your speed free.