Optimising Mobile Performance: Fast Pages on the Smartphone

Most people see your website for the first time on their phone. During the lunch break, on the tram, quickly in between. And that's exactly where patience is shortest: if it doesn't load promptly, the thumb is already back on the back button. A page can look flawless at the desk and still feel sluggish and bumpy on the smartphone.

Mobile performance is therefore not a niche topic, but the normal case. Here I'll explain why the phone ticks so differently from the computer, and with which steps you can improve mobile loading time in a targeted way, entirely without jargon.

Why the phone is stricter than the computer

On the desktop your visitor usually sits on a fast connection, with a powerful machine and a large screen. On the phone almost everything is tighter:

• Fluctuating network: On the move the reception changes constantly. Sometimes full 5G, sometimes a tired dead spot in the lift.
• Less computing power: An average smartphone is considerably weaker than a laptop. Heavy code makes it break a sweat faster.
• Small screen, full thumb: What looks airy on the big monitor has to be rearranged on the phone, and that costs the page extra work.

In short: a page that was only tested on the desktop was never really tested. The phone is the harder exam.

Images, the biggest brake

The most common reason for a slow phone page is images that are too heavy. A photo meant for a large monitor has to be laboriously scaled down on the phone, even though only a fraction of it is visible there. That wastes data volume and time.

What really helps:

• Dimension correctly: Serve images at the size they actually appear on the phone, not bigger.
• Compress in a modern way: Formats like WebP weigh considerably less at the same quality than old JPEG files.
• Load later: Load images further down only when the visitor scrolls to them. That way something is visible at the top faster.

Less ballast, more speed

Many pages carry code around on the phone that isn't needed there at all. Page builders and heavy templates often load mountains of fonts, scripts and effects, every little thing has to be downloaded and processed by the phone before anything appears.

Here a lean foundation pays off. The less unnecessary code travels along, the faster the page is there. That's exactly why I build by hand: a hand-made page carries no template rucksack, only what it really needs. You feel that most clearly on the phone.

What you should look at first

You don't have to be a tech pro to assess your page's mobile performance. A few simple checks are enough for a start:

• Test it yourself: Open your page on your own phone, ideally on the mobile network, not on Wi-Fi. How long does it take until you see something meaningful?
• Google PageSpeed Insights: This free tool gives you a mobile rating and concrete hints about what's slowing things down.
• Watch for shifting: Does the layout jump around while loading, so that you accidentally tap the wrong thing? That's a typical mobile annoyance.

If the first seconds on the phone are sluggish, it's almost always a sign of images that are too heavy or too much code, both of which can be improved.

Mobile is no longer a special case

The phone has long been the normal case. For most Swiss SMEs, more than half of visitors today come from a smartphone, with local search often considerably more. So a page that only convinces on the desktop leaves the larger share of prospects out in the rain.

The good news: mobile performance is no black magic. Lean images, little ballast and a solid foundation already achieve a great deal. It's easiest when the page is built with the phone in mind from the start, but improving afterwards is nearly always possible.

If you'd like to know where the snag is on your page, I'm happy to take a look and tell you honestly what can be gained. Just get in touch via the contact form, or first browse through more posts around fast, honest websites.