Site speed and bookings: what a second actually costs

Speed is usually treated as a technical detail, something developers measure among themselves. In reality it is the first experience a guest has of you, and it happens before they see a single photo.

The numbers

According to research by the agency Portent, pages that load in one second convert roughly 2.1 times better than those taking ten seconds. Akamai measured abandonment: around 53 percent of mobile visitors give up if a page does not open within three seconds.

For a host that means half the people who clicked your site never saw the first photo. Not because they disliked it, but because they did not wait.

What Google measures

• LCP: how long until the largest element appears, usually the main photo or headline
• INP: how long the page waits before responding to a tap or click
• CLS: how much the content shifts while loading, which is why you miss the button you aimed for

Google uses those three as part of how it judges a page. They are not the biggest ranking factor, but between two similar pages they tip the balance, and a guest feels them regardless of Google.

What usually slows a site down

• Photos straight from the camera at full size, several megabytes each
• Too many plugins, each adding its own scripts and styles
• An intro animation that has to finish before content appears
• Fonts and scripts loading from somebody else’s servers
• Hosting that shares resources with too many sites
• No caching, so every visit is built from scratch

The biggest win for the least work

Photos. On accommodation sites they are the bulk of the weight and the place with the most to gain. An image that comes off the camera at four megabytes, saved as webp and resized to the dimensions it is actually shown at, often drops below three hundred kilobytes with no visible difference. Across ten photos that is the difference between a site that opens at once and one that takes half a minute on a weak connection.

A guest on a beach with two bars of signal is the real condition your site loads in, not office fibre.

Why hosting matters more than people think

The cheapest shared hosting packages put hundreds of sites on one server. When one of them gets a traffic spike, everything else slows down, yours included. That usually happens in July and August, exactly when you need the site most. If a guest on a phone waits five seconds for apartment photos, a few euros a month saved on hosting becomes the most expensive saving of the year.

How to check your own site

Google PageSpeed Insights is free and scores both mobile and desktop, with a list of what is slowing things down. The score is not everything, but the list is useful. More useful than the score is opening your site on a phone, on mobile data, and counting the seconds to the first photo.

For comparison, the site you are reading renders its main content in about 648 milliseconds on a repeat visit. That is not magic but the sum of small things: webp images, self-hosted fonts, no external scripts and caching set up properly.