Mobile users are impatient — and rightly so. If your website takes more than three seconds to load on a smartphone, you’re losing customers. With Google’s mobile-first indexing, a slow mobile site also hurts your rankings. Here’s how to make your website faster on mobile devices.
Start by Measuring the Problem
Before you fix anything, measure your current mobile speed. Go to pagespeed.web.dev, enter your URL, and check your mobile score. Make note of the specific issues Google flags — these are your priorities. Aim for a score above 75 on mobile.
Compress and Convert Your Images
Images are typically the single biggest cause of slow mobile load times. Compress every image before uploading it to your website. Better yet, convert images to WebP format — it’s up to 30% smaller than JPEG with the same visual quality. Tools like Squoosh.app and ShortPixel make this easy. Also ensure images are correctly sized — never upload a 4,000px wide image to display at 400px.
Enable Lazy Loading
Lazy loading means images and videos only load when the user scrolls to them, rather than all at once when the page first loads. This dramatically reduces initial load time on mobile. Most modern WordPress themes support lazy loading natively, and you can also add the ‘loading=lazy’ attribute to your image HTML tags.
Minimise Unnecessary Scripts and Plugins
Every plugin, tracking pixel, chat widget, and pop-up tool adds load time to your mobile site. Audit your plugins and third-party scripts ruthlessly — if you don’t need it, remove it. On WordPress, tools like Query Monitor can show you exactly which plugins are slowing your site down.
Use a Content Delivery Network (CDN)
A CDN stores copies of your website’s files on servers around the world, so visitors load your site from the nearest server rather than your original hosting location. For New Zealand businesses with international visitors, this makes a significant difference. Cloudflare offers a free CDN plan that’s easy to set up.
Upgrade Your Hosting
If you’re on cheap shared hosting, your server response time may be killing your mobile speed before any other factor. New Zealand-based hosting providers like Netlify, SiteGround, or dedicated NZ hosts offer significantly faster response times than budget offshore providers. Look for hosting with a Time to First Byte (TTFB) under 200ms.
Minify CSS, JavaScript, and HTML
Minification removes unnecessary spaces, comments, and characters from your code files, making them smaller and faster to download. On WordPress, caching plugins like WP Rocket or LiteSpeed Cache handle this automatically. For custom sites, tools like Webpack or online minifiers can process your files.
Test on Real Devices
Don’t rely solely on automated tools. Test your website on your actual smartphone — and ask a friend to test it on theirs (ideally a different device). Try loading key pages on a 4G connection in different locations. Real-world testing often reveals issues that lab tools miss.