Speed is not a technical nicety. It is one of the few things on your website that directly decides whether a visitor stays or leaves before your page even finishes loading.
Google’s mobile speed research put it at 53%: more than half of mobile visitors abandon a page that takes longer than three seconds to load. The study is from 2016 and gets quoted to death, but the direction has only sharpened since, because phones got faster and patience did not. These are not people who bounce after reading. They never see your business at all.
Deloitte measured the other end of it across 37 retail and travel brands, and the numbers are smaller than you would expect in a good way.
- Mobile load time improved by
- 0.1 seconds
- Retail conversions
- +8.4%
- Retail average order value
- +9.2%
- Travel conversions
- +10.1%
One tenth of one second bought all of that. Most slow sites are two or three whole seconds behind, which is why a performance pass tends to pay for itself faster than anything else on the list.
Where the cost actually lands
- Lost enquiries: every visitor who leaves before the page loads is a customer handed to a faster competitor.
- Lower rankings: Google uses speed (Core Web Vitals) as a ranking signal, so slow pages get seen by fewer people to begin with.
- Wasted ad spend: if you pay for clicks that land on a slow page, you are paying to send people to a door that opens too slowly.
The fixes that matter most
- Right-size your images. Oversized images are the single most common cause of slow pages. Modern formats and correct dimensions often cut load time in half.
- Cut the scripts you do not need. Every third-party tag, chat widget and tracker adds weight. Keep the ones that earn their place.
- Serve from the edge. A modern host delivers your site from a location near each visitor, so it arrives faster everywhere.
- Stop layout shift. Content that jumps around while loading feels broken and hurts your Core Web Vitals score. Reserve space for images and embeds.
