Open Google Analytics on your site and look at which devices your visitors come from. If you see that over 60–70% are from mobile phones — don’t be surprised. That is the norm for 2026. Be surprised if your site is still not designed with them in mind.
Mobile traffic overtook desktop worldwide long ago. In Bulgaria the trend is the same: people search for services, compare prices, and make decisions while they are on the metro, in a queue, or on the sofa. If your site gives them a bad experience in those moments, they hit “back” and go to your competitor.
53% of mobile users leave a site that takes more than 3 seconds to load. Every second of delay reduces conversions by around 7%.
What does a “mobile-optimised” site actually mean?
“Mobile-optimised” does not simply mean “looks more or less OK” on a phone. It means the site is designed with the mobile user as the priority — from the size of the buttons to the loading speed.
- Responsive design — the layout adapts automatically to any screen size
- Readable text without zoom — a minimum 16px body font, sufficient contrast
- Tappable buttons — at least 44×44px, with enough space between them
- Fast loading — optimised images, minimal code, no unnecessary scripts
- No horizontal scroll — the content fits within the screen width
- Easy access to contacts — the phone number is click-to-call, the form works with a mobile keyboard
Why Google requires it — not just users
Since 2019 Google has used Mobile-First Indexing — it indexes and ranks sites based on their mobile version. If your desktop version is perfect but the mobile one is broken or slow, Google penalises you in the rankings for all devices.
In practical terms: even if your competitor has an older site, but it loads quickly on a phone — it may outrank you in the search results, purely because of the mobile experience.
Core Web Vitals — the metrics Google uses to measure page quality — are measured mainly on mobile devices. Poor results there mean a lower SEO ranking everywhere.
The five most common problems with mobile sites
- Slow loading — uncompressed images, blocking scripts, a missing cache. The main killer of mobile traffic
- Small buttons and links — the user taps the wrong spot, gets frustrated, and leaves
- Pop-ups blocking the content — Google penalises aggressive interstitials on mobile devices
- Incorrectly displayed forms — fields wider than the screen, the wrong keyboard types, unvalidated fields
- Font too small to read — the user has to zoom in; Google also flags it as a problem
How to check whether your site has a problem
You don’t need a specialist to run an initial diagnosis. Three free tools:
- Google PageSpeed Insights (pagespeed.web.dev) — enter your site’s URL and see the score for mobile devices. Under 50 is a problem; over 80 is good
- Google Search Console → “Mobile Usability” — shows specific errors: small elements, text too small, content wider than the screen
- Your own phone — open the site on a real Android and iPhone. If something annoys you — it annoys your customers too
Mobile optimisation and conversions
Mobile users behave differently from desktop users. They are more impatient, more likely to call directly, and less likely to fill in long forms. A good mobile site takes this into account:
- The phone number is always visible and is a tel: link — one tap to call
- A WhatsApp button for a quick message — many people prefer chat over a call
- The forms are short — only the required fields
- The call to action (CTA) is visible without scrolling — in the top half of the screen
- The address is a link to Google Maps — one tap for navigation
Businesses with a well-optimised mobile site receive on average 2× more enquiries from mobile traffic than those with a poor mobile experience — for the same number of visitors.
Responsive design versus a separate mobile version
The old approach was to build a separate “m.” subdomain for mobile devices. Today Google explicitly recommends responsive design — one URL, one HTML, different CSS for different screens. It is easier to maintain, better for SEO, and avoids duplicate content.
All the sites we build at Web Fabrika are responsive by definition — we test them on real devices, not just in browser developer tools.
When is it time for a new site?
If your site was built before 2019–2020 and has not been through serious mobile optimisation, it is probably more effective to replace it than to patch the problems one by one. The signs that the time has come:
- A PageSpeed mobile score under 40
- A bounce rate from mobile devices over 80% in Analytics
- Phone users don’t convert at all
- The site does not look good on an iPhone with a smaller screen (SE, Mini)
- You have a separate “m.” version that differs from the desktop version
Summary: Over 70% of your customers are on a phone. If your site gives them a bad experience — you lose them in real time. Mobile optimisation is not a “nice to have” — it is the fundamental requirement for an online presence in 2026.