Growth AuditHow to Improve Your Website Speed: A Practical Guide
If your website takes more than a couple of seconds to load, you’re losing visitors before they ever see what you offer — and Google is quietly penalising your rankings for it too. The good news is that website speed problems are almost always caused by a small, predictable set of issues. Here’s how to find and fix them, in priority order.
Why speed matters more than most business owners realise
Google uses three specific metrics — called Core Web Vitals — as a confirmed ranking factor:
- Largest Contentful Paint (LCP): how long it takes for your main content to appear. Target: under 2.5 seconds.
- Cumulative Layout Shift (CLS): how much elements jump around while the page loads. Target: under 0.1.
- Interaction to Next Paint (INP): how quickly the page responds when someone clicks or taps. Target: under 200ms.
Beyond SEO, speed directly affects conversion. Studies consistently show bounce rate climbing sharply for every additional second of load time — a slow site doesn’t just rank worse, it actively turns visitors away before they see your call-to-action.
The most common causes, in order of impact
1. Unoptimised images
This is, by a wide margin, the most common cause of slow websites. A single uncompressed photo straight off a phone camera can be 4-8MB — dozens of times larger than it needs to be for web display. Fixes:
- Resize images to the actual dimensions they’ll display at (don’t upload a 4000px-wide photo into a 600px-wide container)
- Compress with a tool like Squoosh or TinyPNG before uploading
- Use modern formats (WebP or AVIF) where your platform supports them
- Lazy-load images below the fold so they don’t compete with visible content for bandwidth
2. Render-blocking CSS and JavaScript
Browsers can’t display anything until they’ve downloaded and processed the CSS and JavaScript referenced in your page’s <head>. Large, unused stylesheets or scripts delay that first paint. Fixes:
- Remove unused CSS/JS (many page builders and themes load libraries you’re not actually using)
- Defer non-critical JavaScript so it loads after the visible content
- Inline critical CSS for above-the-fold content where possible
3. Missing compression and caching
Text-based files (HTML, CSS, JS) compress extremely well — often 70%+ smaller with gzip or brotli compression enabled. Most modern hosting enables this by default, but it’s worth checking. Separately, browser caching means returning visitors don’t re-download assets that haven’t changed — a quick win that’s often simply misconfigured rather than missing entirely.
4. Layout shift from unsized media
If images or embeds don’t have their dimensions specified in the HTML, the browser doesn’t know how much space to reserve for them — causing the page to visibly jump as they load in. Always specify width and height attributes (or use CSS aspect-ratio) on images and embeds.
How to check where you actually stand
Rather than guessing which of these apply to your site, the fastest way to know for certain is to test it directly. Google’s own PageSpeed Insights gives you real Core Web Vitals data, and our free website speed test uses that same data to give you a prioritised, plain-English list of exactly what’s slowing your site down — as part of a full audit covering SEO, accessibility, trust and conversion too.
The bottom line
Website speed isn’t a one-time fix — new images, plugins and features can quietly reintroduce the same problems over time. Building a habit of checking every few months (especially after adding new content or features) keeps your site fast, keeps Google happy, and keeps visitors from bouncing before they see what you do.
Ready to see where your site stands? Run a free website audit and get your Core Web Vitals score in under 30 seconds.