Why is my website slow (and does it matter)?
A slow website usually comes down to a handful of things: oversized images, too many apps and widgets, the platform's own code, where it is hosted, and no caching. Some of that you can fix yourself in an afternoon. Some is baked into the platform you chose, and no amount of tuning fully removes it. And yes, it matters: speed affects whether Google ranks you, whether AI can read you, and whether visitors stay.
"Why is my website slow?" has two answers hiding inside it. Part of the slowness is things you have added or can change. Part is the platform's own baseline weight, which sets a ceiling you cannot tune past. Knowing which is which saves you a lot of wasted effort, so let's separate them.
Does speed actually matter? #
Yes, in three ways. Rankings: Google measures how fast your pages really load for visitors (it calls this Core Web Vitals) and uses it to decide where you rank. AI: tools read fast, clean pages more fully and are more likely to quote them. Money: people leave a slow page, and the ones who stay buy less. The data on that last point is hard to ignore:
- More than half of mobile visits are abandoned when a page takes longer than three seconds to load. (Google, 2017)
- A tenth of a second faster lifted retail conversions by 8.4% and shopper spend by 9.2%. (Google & Deloitte, "Milliseconds Make Millions", 2020)
- A page that loads in one second converts around three times higher than one that takes five seconds. (Portent, analysis of 100M+ page views, 2022)
In other words, speed is not a technical nicety, it is a revenue lever. A slow site quietly caps how well everything else you do can perform.
The usual causes of a slow site #
Almost every slow website is slow for some mix of these six reasons.
- Oversized images. The single most common cause, and usually the easiest to fix. A photo straight off a phone or camera can be ten times larger than the page needs.
- Too many apps, plugins and widgets. Each booking tool, pop-up, chat box or review feed loads its own code. A few is fine; a dozen is a traffic jam.
- The platform's own code. Every builder loads its own scripts to make the page work. On some platforms that is light; on others it loads a lot before your content even appears.
- Where it is hosted. If your site sits on one slow or distant server, every visitor waits for it to respond. Fast platforms serve copies from close to each visitor.
- Fonts and third-party embeds. Custom fonts, embedded maps, videos and tracking scripts each add weight and round-trips.
- No caching. Without it, the site is rebuilt from scratch for every visitor instead of serving a ready-made copy. Good platforms do this for you; some need it set up.
Why each platform is slow (or fast) #
For each one, the main drag that comes with the platform, and what is actually in your control.
Squarespace
The main drag The templates carry a lot of built-in code and run on a heavy page engine, so pages are weighty and often score poorly on mobile, no matter how simple they look.
What you control Compress images before uploading, use fewer blocks and third-party embeds, and keep to one or two fonts. It helps, but a chunk of the weight is the platform's and stays.
Wix
The main drag Historically one of the heaviest builders, loading a lot of its own code up front. It has improved, but pages still tend to be heavier than a custom build, and anything built with its advanced tools adds more.
What you control Compress images, limit the number of apps you install, and lean on its newer, lighter editor. The baseline weight, though, is set by Wix.
Weebly
The main drag An older platform that has been largely left alone by its owner, so it lacks the modern speed tooling the others have added. Little has been done to keep pages light.
What you control Not much beyond trimming images and content. There is no real performance headroom to tune into.
Webflow fast by default
The main drag Very little. It produces clean, light code and serves it from a fast global network, so it consistently tops the rented builders on speed.
What you control Almost all of it. Slow Webflow sites are nearly always down to heavy animations or big unoptimised images the owner added, which means you can fix them.
Framer
The main drag It loads a large behind-the-scenes app (a React runtime) before your content shows, which can feel quick on a laptop but drags mobile performance noticeably, and mobile is what Google judges.
What you control You can trim images and heavy effects, but the runtime itself stays, so there is a firm ceiling on how fast a Framer site can get on a phone.
WordPress
The main drag WordPress builds every page fresh from a database each time someone visits (a "dynamic" site), which is slower by nature than handing over a ready-made page. Add a heavy theme, a stack of plugins and cheap shared hosting, the classic recipe, and it crawls. This set-up is extremely common.
What you control Nearly everything, which is both the upside and the work. A good host, a lean theme, fewer plugins and compressed images all help. The usual speed fix is a caching plugin, which saves a ready-made copy of each page so visitors are not waiting for it to be rebuilt.
The catch Caching is fiddly. Because the site is dynamic and every theme and plugin behaves differently, a caching plugin can clash with them and quietly break your layout, forms or checkout, so it needs careful testing and often a developer to tune without something falling over. Fast WordPress is very achievable, it is just rarely a one-click job.
Shopify
The main drag The core is fast, served from a big global network. The usual culprit is apps: each one you add (reviews, upsells, pop-ups) injects its own code, and a heavy theme adds more.
What you control A lot. Audit and remove apps you do not need, choose a lighter theme, and compress product images. Most slow Shopify stores are app-bloated, not Shopify's fault.
Custom build on Cloudflare as fast as the web gets
The main drag Essentially none. The pages are light, built with only the code they need, and served from a network sitting close to every visitor. This is the fastest option available.
What you control All of it. There is no platform weight working against you, so speed is a design choice, not a fight.
What you can fix yourself today #
Whatever you are on, these move the needle on almost any site, and most take an afternoon.
- Compress and resize your images. The biggest, fastest win. Size them to how they actually appear and run them through a free compressor first.
- Remove apps and plugins you do not use. Every one you drop is code the page no longer has to load.
- Cut back custom fonts. One or two is plenty; each extra weight and style is another download.
- Lazy-load below-the-fold images. So the page shows what is on screen first and loads the rest as the visitor scrolls. Most platforms have a setting for this.
- Test on mobile, not desktop. Run your page through Google's free PageSpeed Insights and read the mobile score, because that is the one Google uses.
The bit you can't fix #
Some slowness you can fix in an afternoon. Some is the platform's weight, and the only way past it is a different platform.
If you have compressed the images, cut the apps and your site is still slow on mobile, you have likely hit the platform's ceiling. That is not a failure on your part, it is the trade you made when you chose a builder that does a lot for you. When speed genuinely decides whether you get found and win work, the fix is a lighter, faster foundation, not another round of tuning. We explain how platform choice sets that ceiling in which website platform is best for SEO.
Common questions about website speed #
Why is my website slow?
Usually a mix of a few things: oversized images, too many apps, plugins or widgets each loading their own code, the platform's own scripts, slow or distant hosting, and no caching. Some of that you can fix yourself in an afternoon; some is built into the platform you chose and no amount of tuning fully removes it.
Does website speed affect my Google ranking?
Yes. Google measures real-world loading speed (Core Web Vitals) and uses it as a ranking factor, and faster pages are also read more fully by AI tools. Speed is not the only factor, but a slow site is quietly held back no matter how good everything else is.
Does website speed affect sales and conversions?
Yes, measurably. Google and Deloitte found that improving mobile load time by just a tenth of a second lifted retail conversions by 8.4% and shopper spend by 9.2% ("Milliseconds Make Millions", 2020). Portent's analysis of over 100 million page views found a page that loads in one second converts around three times higher than one that takes five seconds (2022). Faster pages do not just rank better, they turn more visitors into enquiries and sales.
What is a good page speed score?
On Google's PageSpeed Insights, 90 or above (green) is good, 50 to 89 (orange) needs work, and under 50 (red) is poor. Test on mobile, not desktop, because mobile is what Google judges you on and it is where most sites struggle.
Why is my Squarespace or Wix site slow on mobile?
Both load a lot of their own code before your content appears, and the pages tend to be heavier than a custom build, which shows up most on phones. You can help by compressing images and using fewer blocks and apps, but part of the weight is built into the platform and cannot be removed.
Can I make my website faster without rebuilding it?
Often, yes. Compressing and correctly sizing images, removing apps and plugins you do not use, limiting custom fonts and lazy-loading images below the fold will speed up almost any site. What that cannot change is the platform's own baseline weight, which sets the ceiling on how fast it can ever be.
Which website platform is fastest?
A custom build on a global network like Cloudflare is the fastest, because the pages are light and served from close to every visitor. Webflow is the quickest of the rented builders. Framer can feel fast on a laptop but its heavy script drags mobile. The classic builders sit mid-pack, and WordPress swings from very fast to very slow depending entirely on its setup.