Mobile Website: Why Most of Your Clients Search on Smartphone

The majority of local searches in Luxembourg today happen on a smartphone. Someone looks for an electrician, a pharmacy or a restaurant — they pull out their phone, type their query, and scan the results in a matter of seconds.

This behaviour has a direct consequence: if your website isn’t built to work on mobile, you lose a share of those clients before they’ve even had a chance to read who you are.

How much does mobile really represent?

According to Google’s most recent data (Google Search Central – Mobile-first indexing), more than 60% of worldwide searches happen on mobile, and that figure exceeds 70% for local searches (businesses, services, restaurants, shops). In Luxembourg, sector studies confirm that tradespeople, restaurateurs and proximity services receive 65-80% of their traffic via mobile depending on sector.

Concretely: for a Luxembourg plumber or hairdresser, 7 out of 10 visitors are on smartphone. For a B2B law firm, it’s more like 40-50%. But in every case, mobile crosses the threshold where ignoring it becomes commercial sabotage.

What happens when a site doesn’t work well on mobile

The experience is frustrating and immediate:

• Text is too small to read without zooming
• Buttons are too close together to tap accurately
• The phone number isn’t clickable (the client has to memorise it then dial manually)
• The page takes several seconds to load on a normal 4G connection
• The menu is hidden or doesn’t open correctly
• Forms are long, ill-suited to a touch keyboard

In that situation, the vast majority of users don’t persist — they go back and click on the next result. That decision takes under three seconds.

It’s not a question of patience or excessive standards. It’s simply that other sites work better, and the client has no reason to stay on one that makes their life harder.

What “mobile-first” actually means

Mobile-first doesn’t mean having a site that “displays on mobile.” It means designing the site starting from mobile — the most constrained format — and adapting it for larger screens from there.

A genuinely mobile-first site has:

Smooth reading without zooming. Text legible from page open (minimum 16px), clear visual hierarchy, nothing overflows the screen. No horizontal scroll.

Immediately accessible actions. The phone number is clickable via tel:, a contact button is visible without scrolling, forms are short (3-5 fields maximum) and easy to fill on a touch keyboard (proper input types: tel, email, number).

Speed that fits the context. Images are compressed and loaded progressively (lazy loading). The page displays its main content in under a second, even on an average 4G connection. For details, see our article on why a slow site loses clients in 3 seconds.

Simple navigation. Hamburger menu accessible one-handed, links spaced far enough apart (minimum tap target 44×44 pixels recommended by Apple HIG and Material Design), back navigation works logically.

Why so many sites fail on this point

Most websites built on WordPress with generic themes are designed for desktop rendering. The mobile adaptation is added after the fact — often automatically, without real attention. The result is technically “responsive” but not truly usable.

Typical symptoms:

• Images aren’t optimised for mobile and slow loading
• Columns stack awkwardly on small screens
• Dropdown menus don’t behave well on touch
• Background videos make phones lag
• Custom fonts don’t load for 3-4 seconds
• Checkout/forms fail on 10-20% of mobile browsers

These aren’t impossible problems to fix, but they require rethinking the underlying logic of how the site is built — not just adding CSS.

The link with Google rankings

Since 2021, Google uses mobile-first indexing (official announcement): it evaluates your site primarily through its mobile version when deciding how to rank it in search results.

A site that performs poorly on mobile is therefore penalised twice:

1. It disappoints visitors who arrive on it
2. It ranks lower in Google, which reduces the number of visitors who get there in the first place

The two problems compound each other. A fast, mobile-friendly site, on the other hand, benefits on both fronts.

What this means specifically for Luxembourg

In Luxembourg, the population is particularly mobile — a significant number of people work in a different country from where they live (cross-border workers from France, Belgium, Germany), travel regularly between cities, and search for local services on the go.

Added to this is linguistic diversity: a client may search for your service in French, German or English from their phone. According to STATEC data, close to 47% of residents and cross-border workers speak a language other than French as their first language. A fast, readable, trilingual site captures far more of that traffic than a monolingual, slow one.

Another specificity: Luxembourg’s 5G/4G coverage is excellent in cities but uneven in rural areas and valleys (Müllerthal, Éislek). A lightweight site works everywhere; a heavy site struggles as soon as the connection drops.

Concrete things to check on your site

If you want to evaluate your current site’s mobile performance:

1. Open it on your own phone, without WiFi (use mobile data)
2. Try to find your phone number and call with one tap
3. Attempt to fill in your contact form on smartphone
4. Measure load time with PageSpeed Insights in mobile mode
5. Test with Google Mobile-Friendly Test
6. Check mobile Core Web Vitals in Google Search Console

If any of these causes friction, your mobile visitors experience it too — and some leave without contacting you.

Common mobile-specific mistakes

• Intrusive pop-ups: Google has penalised since 2017 interstitials that block content on mobile (Mobile interstitials penalty)
• Non-clickable phone number: don’t force the client to memorise then dial
• Long forms: each extra field drops mobile conversion 10-15%
• Tiny text: minimum 16px on mobile, otherwise forced zoom
• Hover effects that don’t work on touch: avoid for clickable elements
• Autoplay videos with sound: not just intrusive but blocked by default on iOS and Android

Our approach

At slash.lu, every site we build is developed mobile-first with Astro.js, a framework that generates ultra-lightweight static pages. Images are systematically converted to WebP/AVIF and sized according to the screen. The result is a site that loads in under a second on mobile, even on average 4G.

Our clients like Innovalux, AutoRachat, Sellect and Tack all have sites built on this principle — not an option, a foundation.

If you’d like us to look at your current site and identify what can be improved on mobile, let’s talk. To go further on common SME website mistakes, also read why your website doesn’t generate clients.

Let's talk about your situation. Book a call — no commitment, reply within 24h.

→ Going further: our web design service .