---
title: "How to Speed Up Your Slow Website | Lighthouse Local"
description: "Only about half of sites pass Google's speed test, usually because of images. Here's how to speed up your website, in order of impact, biggest wins first."
source: "https://www.lighthouselocal.ai/blog/how-to-speed-up-your-website"
---
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# How to Speed Up Your Website, Biggest Wins First
[Will Colachis Head of Growth, Lighthouse Local](https://www.lighthouselocal.ai/blog/authors/will-colachis) August 30, 2026 • 8 min read
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## Why Half the Web Is Too Slow
Here's a number that reframes the whole problem. The [Web Almanac](https://almanac.httparchive.org/en/2025/performance) found, in its report published in 2026, that only about half of all websites pass Google's speed test, 48 percent of them on mobile, measured on real visitors. So if your site feels slow, you're in good company, and the reasons are surprisingly consistent from one site to the next.
That same data points at one culprit above the rest. It's not fancy code or clever interactivity, it's loading, and loading is mostly weight. The single heaviest thing on a typical page is almost always the images. So the fastest path to a quicker site isn't a rebuild, it's working down a short list in order, heaviest first.
One note before the fixes. Guessing wastes time, so measure first. If you haven't run a speed test yet, our guide to [Core Web Vitals and how to measure them](https://www.lighthouselocal.ai/blog/core-web-vitals-explained) covers it in two minutes. This piece picks up where that one leaves off, with the report already in your hands.
## Fix Your Images First
If you do one thing, do this. On a typical page the images outweigh everything else combined, more than the code, the fonts, and the rest put together. Shrink them and the whole page gets lighter in a hurry.
Three moves cover most of it. First, save your photos in a modern format like WebP or AVIF, which pack the same picture into a fraction of the file size of an old JPEG or PNG. Second, stop serving giant images the browser has to shrink on the fly, export them at the size they actually display, since a 3000-pixel photo in a 600-pixel slot is pure wasted weight. Third, compress them, because most photos shed nothing a visitor can notice at a smaller file size.
Then two rules about loading, and the order matters. Add lazy loading to every image below the fold so it waits until someone scrolls near it. But never lazy-load your biggest above-the-fold image, the one a visitor sees first, [Google's own guidance](https://web.dev/articles/optimize-lcp) is blunt that doing so always slows the page down. Mark that hero image as high priority instead, so the browser reaches for it first.
## Tame the JavaScript and Third-Party Scripts
After images, the next weight is code, and the worst of it usually isn't yours. It's the third-party scripts you bolted on and forgot, the chat widget, the analytics tags, the social feed, the review popup. Each one drags in its own pile of JavaScript, and JavaScript is the thing that makes a page feel sluggish the moment someone taps or scrolls.
Start by pruning. List every third-party tool loading on your site, then cut the ones you don't really use. For the ones you keep, load them late instead of up front, a chat widget doesn't need to arrive before your content does. Defer anything that isn't needed for the first view, and load heavy embeds like maps and videos only when a visitor actually scrolls to them.
The payoff is responsiveness. When the browser isn't tied up running scripts, it's free to react the instant someone interacts, which is exactly what [Google's guidance on interaction speed](https://web.dev/articles/optimize-inp) tells you to protect. Fewer scripts, loaded later, is most of the battle.
## Speed Up Delivery and Stop the Jumps
Two smaller levers round it out, and both are quick. The first is delivery. Put your site behind a content delivery network, a CDN, which keeps copies of your pages on servers near your visitors so they arrive faster no matter where someone opens them. Most hosts and site builders offer one with a single switch, and it's among the cleanest wins for the effort. Cache your pages while you're at it, so a repeat visitor loads a saved copy instead of building it from scratch.
The second is stability, the page not lurching around as it loads. You've felt the other side of it, you go to tap a button and an image pops in above it and shoves it down. The fix is simple, give every image and embed a set width and height, or a reserved aspect ratio, so the browser holds the space before the file lands. While you're in there, self-host your main font and let text show in a fallback until it arrives, so words never sit invisible waiting on a download.
## Let AI Do the Heavy Lifting
This is the part that makes it all doable without a developer. You don't have to know how to convert an image or defer a script, you just have to know the order, and now you do. Hand that order to an AI assistant along with your platform, and let it walk you through each fix.
Paste something like this, filled in for your own site.
Copy
```
I want to speed up my website and I'm not a developer. My site is on [WordPress, Shopify, Squarespace, or other] at [your URL].
Walk me through these fixes in order, easiest first, with the exact steps for my platform.
1. Convert my images to WebP or AVIF, compress them, and size them correctly.
2. Lazy-load images below the fold, but set my main hero image to high priority.
3. Find third-party scripts I can remove or load later.
4. Turn on a CDN and page caching.
5. Set width and height on images so the layout stops shifting.
For each one, tell me whether I can do it myself or need my developer.
```
What comes back is a plain, step-by-step plan in the order that matters. If your speed report flagged something specific, paste that in too, and the assistant folds it into the same list. It's how you'd tackle your [local schema markup](https://www.lighthouselocal.ai/blog/what-is-local-schema-markup) or any other technical to-do, describe what you want in plain words and let the assistant handle the how.
## A Faster Site Is a More Visible One
Once you've worked the list, prove it. Run the speed test again and watch the three numbers that decide it, your biggest image loading in under 2.5 seconds, taps responding in under 200 milliseconds, and the layout holding still while it loads. Clear those on mobile, where most of your customers are, and you've passed the bar that half the web still fails.
Speed pays off twice, though. The same lean pages that keep visitors from leaving are the ones machines read most cleanly, the very readability behind [getting recommended by AI](https://www.lighthouselocal.ai/blog/how-to-get-your-business-recommended-by-ai). Our [free AI visibility audit](https://audits.lighthouselocal.ai/?utm_source=lighthouselocal&utm_medium=marketing-site&utm_campaign=blog-how-to-speed-up-your-website&utm_content=post-body) checks your speed alongside the other on-site signals a model reads and ranks the fixes by what helps most, while Lighthouse Local's [AI visibility tracker](https://www.lighthouselocal.ai/how-it-works) watches whether the work turns into mentions across ChatGPT, Gemini, Claude, Perplexity, and Google AI. So start at the top of the list, with the images, and keep going. Speed up the site, and you make it more visible in the same move.
## Frequently asked questions
### What slows a website down the most?
Loading, and usually the images. On a typical page they outweigh the code, the fonts, and everything else combined, so oversized, uncompressed photos are the first thing to fix. Heavy third-party scripts are the usual runner-up.
### Can I speed up my site without a developer?
Mostly, yes. Compressing images, switching on a CDN, and removing unused scripts are all doable in your site builder, and an AI assistant can walk you through each one for your platform. A few deeper fixes may need your developer, and that's fine.
### WebP or AVIF, which should I use?
Either one beats an old JPEG or PNG by a wide margin. AVIF usually makes the smaller file, while WebP has slightly broader support and is the safe default. Most site builders and image tools can export both now.
### How fast is fast enough?
Aim for Google's three targets on mobile, your main content loading in under 2.5 seconds, taps responding in under 200 milliseconds, and almost no layout shift. Hit those across real visitors and you're ahead of about half the web.
## Mentioned in this guide
[Core Web Vitals explained](https://www.lighthouselocal.ai/blog/core-web-vitals-explained) [How to get recommended by AI](https://www.lighthouselocal.ai/blog/how-to-get-your-business-recommended-by-ai) [Lighthouse Local for Business](https://www.lighthouselocal.ai/for-business)
### Table of contents
[Why Half the Web Is Too Slow](#why-half-the-web-is-too-slow) [Fix Your Images First](#fix-your-images-first) [Tame the JavaScript and Third-Party Scripts](#tame-the-javascript-and-third-party-scripts) [Speed Up Delivery and Stop the Jumps](#speed-up-delivery-and-stop-the-jumps) [Let AI Do the Heavy Lifting](#let-ai-do-the-heavy-lifting) [A Faster Site Is a More Visible One](#a-faster-site-is-a-more-visible-one) [Frequently asked questions](#faq)
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