When a site is slow to load, most visitors don’t wait. They close the tab and move to the next result. That decision happens within a few seconds — and it costs you clients you’ll never even know about.
This isn’t a marginal problem. It’s one of the most common issues on Luxembourg business websites, and one of the least visible to the site owner, who typically checks it over WiFi from their desk.
What slowness actually does
A visitor arriving on your site from Google has no obligation to be patient with you. If the page loads too slowly, they go back to the results and click on the next one. This behaviour is systematic on mobile, where connections are sometimes less stable and users expect an immediate response.
Slowness has two compounding effects: it drives away visitors who arrive on your site, and it degrades your ranking in Google’s results. The second point is less well known but equally important: for several years, Google has incorporated loading speed into its ranking criteria, notably through Core Web Vitals.
A slow site is therefore less visible and less effective at the same time.
The most common causes
The majority of slow sites suffer from the same problems.
Images that are too heavy. A photo taken with a modern camera can weigh several megabytes. On an unoptimised site, it’s loaded as-is. A properly compressed image converted to WebP can weigh ten times less for a visually identical result.
Low-end shared hosting. An overloaded server takes longer to respond to requests. Server response time is often the primary cause of slowness, before the page weight is even a factor.
Scripts loaded unnecessarily. Chat widgets, analytics tools, tracking scripts — every third-party element added to a page has a loading time cost. Many sites accumulate these without measuring their impact.
An overloaded CMS. WordPress with many plugins generates a lot of code, database queries and processing on every visit. A statically generated site doesn’t have this problem: pages are prepared in advance and served directly, with no on-the-fly computation.
What a good performance score means
The reference tool for measuring a site’s speed is PageSpeed Insights, offered for free by Google. It gives a score from 0 to 100 and details the issues found.
A score below 50 on mobile means the site has serious problems. Between 50 and 89, there are improvements to be made. From 90 upwards, the site is considered performant.
The majority of WordPress sites with generic themes score in the 30–60 range on mobile. This is measurable, and it’s directly linked to the number of clients you’re losing.
What changes when you build differently
At Slash.lu, every site is built with Astro.js in static mode. Pages are generated once at build time and served directly from a CDN — no server-side computation on every visit. Images are systematically converted to WebP and resized according to the actual display size.
The typical result: a PageSpeed score between 95 and 100 on mobile, and a load time under one second on a normal connection.
This isn’t a technical feat. It’s simply what happens when you treat performance as a starting constraint rather than a late-stage adjustment. It’s the founding principle behind our web design service .
How to check your site’s performance
Go to pagespeed.web.dev, enter your URL and run the analysis. Focus first on the mobile score — that’s where problems are typically most visible.
If your score is below 70 on mobile, a significant portion of your visitors are leaving your site before they’ve even read your content. It’s a problem that can be diagnosed and fixed.
Where to start
If your site is slow, the first things to address are image optimisation, reviewing your hosting, and removing non-essential scripts. These are measures that can have a quick impact without rebuilding the entire site.
If the problems run deeper — an overloaded CMS, an architecture not suited to mobile — rebuilding on a modern framework is often the most effective solution in the medium term.
If you’d like us to look at your site and identify what’s slowing it down, contact us.
To understand how performance connects with local search rankings, read our article on how to dominate your area in 90 days through local SEO.