Simple ways to improve your website's loading speed

Your site takes three seconds to appear. To you, that is nothing much. To Google and to your visitors, it is far too long.

The figures are clear. 53% of mobile visits are abandoned if the page takes more than three seconds to load. One extra second of delay can cut conversions by 7%. And since 2021 Google has folded the Core Web Vitals, a set of performance metrics, straight into its ranking algorithm.

Loading speed is no longer a technical detail reserved for developers. It is a lever of search, of user experience and of revenue, and it has become reachable by any director or marketing lead with no coding skill. The method is simple: a free diagnosis with Google PageSpeed Insights, then using AI to turn that diagnosis into concrete fixes. Here is how to go about it.

Why does loading speed affect your Google ranking?

Core Web Vitals: what Google actually measures on your site

Google no longer stops at analysing your keywords and your backlinks. Since the Core Web Vitals rolled out, it assesses the real experience of your visitors: how fast the main content of the page appears, whether the layout stays stable while it loads, and whether your site responds quickly to interaction.

Those three metrics, LCP (Largest Contentful Paint), CLS (Cumulative Layout Shift) and INP (Interaction to Next Paint), are measured on real users, not in a laboratory. A site scoring poorly on these indicators is structurally disadvantaged in the search results, even if its content is excellent.

The link with SEO is direct. Improving loading speed improves the Core Web Vitals, which improves the Google ranking. And the good news is that Google itself tells you, free of charge, what is slowing your site down.

How do you know whether your site is genuinely slow?

The tool to use first: Google PageSpeed Insights

Before acting, measure. Go to pagespeed.web.dev, enter your site address, and run the analysis. In a few seconds Google gives you a score from 0 to 100 for mobile and for desktop, along with a detailed list of everything slowing your page down: images too heavy, blocking scripts, no caching, badly loaded fonts, and plenty of other technical points.

This is where most directors stop, because the report is dense, technical and written for developers. Terms like "Eliminate render-blocking resources" or "Reduce unused JavaScript" mean nothing to someone who has never touched their site's code.

That blockage is exactly what AI lifts today.

How do you turn the PageSpeed Insights report into concrete action?

Copy, paste, and let the AI do the technical diagnosis

Once your PageSpeed Insights report is generated, you have two options. Hire a developer to interpret each recommendation and fix the code. Or copy the whole report, paste it into Claude, and ask for a clear explanation of each point along with the corrective code to apply.

The method is simple. Open your PageSpeed Insights report. Select all the recommendations shown, notably the "Opportunities" and "Diagnostics" sections. Copy that text. Paste it into a conversation with Claude, saying which kind of site you have (WordPress, Webflow, Shopify, custom-built) and asking for an explanation of each point with the code or configuration to put in place to fix it.

Claude can then break each technical recommendation down into understandable language, identify the priority fixes by their real impact on your score, and generate the necessary code directly: cache rules to add to your .htaccess file, attributes to add to your image tags for lazy loading, scripts to defer to the end of the page, or CSS configuration to avoid layout shifts.

For a WordPress site, that can mean precise instructions on which caching plugin to install and how to configure it. For a custom-built site, Claude can write the lines of code to drop into your files directly. This approach turns an unreadable technical report into a concrete action plan, without needing to master web development.

Which mistakes slow a website down the most?

Six frequent causes, which PageSpeed Insights reveals every time

Most slow sites suffer from the same problems, often accumulated over several years without anyone noticing. Your PageSpeed Insights report will almost always point to a combination of these six causes.

Images that are too heavy are cause number one. A 3 MB photo displayed at 300 pixels wide is the equivalent of a lorry delivering an envelope. The PageSpeed report will tell you precisely which images to compress and by how many kilobytes you can lighten them.

Unoptimised JavaScript and CSS are the second major brake. Large files, loaded in the wrong order, block the page from appearing. PageSpeed lists exactly which files are the problem, and that is information you can hand straight to Claude to get the fix.

Insufficient hosting is often overlooked. Cheap shared hosting simply cannot respond quickly when traffic rises. If your server response time (TTFB) shows red in the report, no amount of code-side optimisation will be enough: you will have to change hosting plan.

Useless plugins on WordPress are a classic trap. Every active plugin adds code to execute. Twenty plugins installed just in case can double the loading time.

The absence of browser caching and server caching forces the browser to re-download every file on every visit. PageSpeed flags this under "Serve static assets with an efficient cache policy" and it is one of the simplest fixes to ask Claude for, as rules to add to your server configuration.

External fonts, such as Google Fonts loaded from a remote server, add an extra network request before the text can appear.

Which optimisations quickly win back several seconds?

The high-impact actions, to ask the AI for first

Once you have your report, some fixes produce quick gains and can be put directly as precise requests.

Compressing images often cuts a page's weight by 40 to 60% on its own. Ask Claude how to automate that compression on your platform, or generate a conversion script straight to WebP or AVIF, two modern formats that give equivalent quality at two to three times less weight than JPEG.

Switching on browser caching and server caching lets a returning visitor load the page almost instantly. If you are on hosting with access to the .htaccess file or to the Nginx configuration, Claude can write the cache rules to drop in directly.

Cutting useless scripts, such as non-essential analytics tools or inactive chat widgets, lightens every page. List all the third-party scripts on your site for Claude so it can help you work out which to keep.

Using a CDN (Content Delivery Network) brings the files physically closer to your visitors. Ask Claude to explain the options available with your current host and the configuration needed to switch it on.

The point of this approach is simple: you do not need to understand every line of the PageSpeed report before acting. You need to copy it, paste it, and ask the right questions to get answers you can act on.

Why does a fast site convert better?

Speed is not only an SEO subject, it is a business subject

The conversion data leaves no room for doubt. Walmart recorded a 2% rise in conversions for every second saved on loading time. Mobify measured that a 100 millisecond improvement on its home page loading time translated into a 1.11% rise in revenue.

The mechanism is simple. A slow site creates friction. The visitor waits, doubts, loses confidence, and leaves. A fast site is a site that tells its visitors you are serious and that you respect their time. That impression translates directly into behaviour: fewer abandonments, more pages viewed, a higher conversion rate.

For an e-commerce site with 10,000 visits a month and an average basket of 80 euros, even a marginal improvement in conversion rate represents several thousand euros of extra revenue a year, for an investment in time counted in hours.

Do you have to rebuild your site entirely to make it fast?

No, in most cases

The short answer is no. Most performance gains are won without a rebuild: image optimisation, caching, cleaning out plugins, compressing assets. A badly optimised WordPress site can go from a score of 35 to 75 on PageSpeed Insights with those adjustments alone, identified by the tool itself and turned into actions by AI.

Some site architectures, such as themes loaded with dozens of scripts or visual page builders that generate excessive code, reach their limits. If after several rounds of fixes your score stays stuck below 50, that is the signal that a more structural intervention, or even a rebuild aimed at performance, becomes worth it. But that is the exception, not the rule.

How do you prepare your site for the SEO demands of 2026?

Google's technical demands evolve every year. The Core Web Vitals are updated regularly, as the replacement of FID by INP in 2024 showed. Mobile optimisation has not been optional since the move to Mobile First Indexing. And the search engines folding AI into their results will progressively favour sources whose content is fast, stable and accessible.

The good news is that the method stays the same over time: Google PageSpeed Insights will keep flagging new performance criteria as they appear, and you only have to run the same process again, report copied, analysed and turned into fixes by AI, to stay aligned with the algorithm's technical demands.

Conclusion: a method within everyone's reach

Improving your site's speed no longer requires hiring a developer or understanding every line of code. The method comes down to three steps: run a report on Google PageSpeed Insights, copy all the technical recommendations, and paste them into a conversation with Claude asking for clear explanations and the corrective code suited to your platform.

This approach democratises a subject that looked, until now, reserved for technical teams. It lets you act yourself, quickly, on the points with the most impact on your ranking and your conversions.

The action to take today: open pagespeed.web.dev, enter your site address, copy the full report, and start the conversation with Claude to turn that diagnosis into a concrete action plan.

SEO FAQ: the questions people ask most about loading speed

Which PageSpeed Insights score should you aim for?

A score above 90 on mobile and on desktop is the ideal target. In practice, a score above 70 on mobile is already an acceptable level for most sites. Below 50, your site is structurally disadvantaged in the Google results and is losing visits. Run the analysis again after each wave of fixes to track your progress.

How do you know which PageSpeed Insights recommendations to handle first?

The report generally sorts opportunities by estimated impact, in milliseconds saved. Copy the whole report into Claude and explicitly ask it to prioritise the fixes by their real impact and by how easy they are to carry out. You will get a ranked list rather than a long undifferentiated technical one.

Can you genuinely fix your site without a developer, thanks to AI?

For a large share of the optimisations, yes: image compression, cache configuration, simplifying scripts, CSS adjustments. AI can generate the exact code to drop in and explain where to place it. For deeper changes touching the site architecture or advanced server configuration, the support of a developer or an agency is still recommended, but the diagnostic work and a large part of the fixes are within reach on your own.

Does loading speed matter more on mobile or on desktop?

On mobile, and by a distance. Google now indexes the mobile version of your site first. And mobile connections are structurally more variable than Wi-Fi. A site that is fast on desktop can be very slow on mobile if its assets are not adapted. Always ask Claude for a fix that takes the mobile constraints specifically into account, not only the desktop score.

Does loading speed have a direct effect on sales?

Yes, and plenty of companies have documented it. One second saved on loading time can raise conversions by several percentage points depending on the sector. On an e-commerce site the effect is immediate and measurable in revenue. On a brochure site or a lead generation site, the impact runs through visit duration and bounce rate, two indicators you can follow in Google Analytics after your fixes.

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