Short answer
Every extra second before your booking page renders costs conversions. Here's what to measure.
Mobile is the only test that matters
Your customers are on a phone, often on mobile data, often outside. Test there, not on the office fibre connection with a desktop browser.
Three metrics
Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200ms, Cumulative Layout Shift under 0.1. If your booking page fails any of these, fix it before you spend a euro on ads.
Usual culprits
Uncompressed hero images, five tracking scripts, an embedded third-party booking iframe, and a font stack that blocks rendering. Removing the iframe alone is often the single biggest win.
Want this handled for you?
Kryson builds websites, booking systems and member portals for Irish wellness businesses. One-time pricing from €497.