Slow websites are quick losers of visitors. That’s not an exaggeration, research by Google found 53% of mobile users will abandon a page that takes longer than 3 seconds to load. That’s more than half your potential audience gone before they’ve seen anything on your page.
Page speed and page size are two of the most influential factors affecting your website’s performance from a technical perspective. Understanding both and knowing how to optimise them can mean the difference between a site that ranks and converts, and one that disappears from first page rankings.
What are page speed and page size?
Page speed refers to how quickly a webpage loads for a visitor. It covers several metrics, including Time to First Byte (TTFB), First Contentful Paint (FCP), and Time to Interactive (TTI). These initialisms also make up part of the Core Web Vitals, a metric made by Google to assess page speed.
Page size is the total amount of data a browser must download to display a page, including images, script, font, and video.
The two are directly linked. A heavier page means more data to transfer, causing slower load times.
Why page speed matters
Users form an opinion about your website in seconds. A slow page tarnishes first impressions before your content even appears on screen. Speed also has a direct impact on bounce rates. The longer a page takes to load, the more visitors leave and the less likely they are to return. Research found a three-second delay in load time can result in a 50% drop in conversions.
With over half of all global web traffic coming from mobile devices, mobile performance is no longer optional. Mobile networks are often slower than broadband connections, making an unoptimised site feel sluggish on a phone. The aim is under two seconds for TTI on mobile.
Google confirmed page speed as a ranking factor, and its Core Web Vitals which measure loading, interactivity, and visual stability are part of how your site is evaluated. A slow site doesn’t just frustrate users, it gets demoted in search results.
Why page size matters
A larger page size directly increases loading times, dragging down your search rankings and frustrating visitors. This performance lag is usually driven by a few common elements, including:
- Images, videos, documents and other high-resolution files. They are the biggest culprits.
- Unoptimised scripts, like JavaScript. These slow render times considerably.
- Custom fonts. Each font used adds additional server requests.
- Ads, particularly those using GIFs or video.
According to data from the HTTP Archive, the average desktop page weighed 3,33448 KB in mid-2026, up from 1,972.4 KB in 2016. That’s a significant increase, and one that has real consequences for load time and user experience. The general opinion of these things is to keep your page size under 3MB, and much lower if you can.
Tools for checking page speed and size
Understanding your page speed and size is critical for optimising your website’s performance and user experience. By analysing these metrics, you can pinpoint bottlenecks and inefficiencies, enabling you to make targeted improvements that enhance your site’s speed, accessibility, and overall efficiency. We often use the following:
- Google PageSpeed Insights provide detailed performance scores and specific recommendations for mobile and desktop.
- Pingdom Tools offer a quick overview of load time, page size, and performance grades as well as recommendations to improve your sites performance.
How to optimise page speed and size
- Compress and convert images
Use tools like Squoosh to reduce image file sizes without sacrificing quality. Where possible, switch to WebP format – it delivers the same visual quality as PNG or JPG at a fraction of the file size.
- Clean up your code
Minify your CSS and JavaScript files to remove unnecessary characters and whitespace. Reduce the number of plugins on your site, particularly on platforms like WordPress, where code bloat is a common speed killer.
- Enable caching
Caching stores a version of your page so returning visitors don’t have to reload everything from scratch. Most platforms support caching natively or via plugins.
- Use GZIP compression
GZIP compresses your site’s files before they’re sent to the browser, reducing transfer size significantly. Many hosting providers enable this by default, but it’s worth confirming.
- Prioritise mobile-first design
Build and test for mobile first. Responsive images, streamlined layouts, and leaner code all contribute to faster mobile load times.
- Invest in quality hosting
Your hosting provider sets a ceiling on your site’s performance. A slow server means a slow site, regardless of how well-optimised your files are. Choose a host with servers located close to your target audience for the fastest possible response times.
Speed and size are non-negotiable
Page speed and page size sit at the intersection of technical SEO, user experience, and conversion rate. You’re handing visitors and rankings to your competitors if you choose to ignore these features.
Run your site through PageSpeed Insights and Pingdom today, identify the problem areas and start with the quick wins, such as compressing your images, enabling caching, and reviewing your hosting setup.
If you’re not sure on where to start, allow us to help. Our in-depth SEO audits pinpoint precisely where your site is falling short on speed and size, and give you a clear, actionable roadmap to fix it. Get in touch with WorkPR today and we’ll get your site performing at its best.
