A slow site loses buyers before the first click, and Google scores you down for it. Both problems have the same fix.
Make My Site FastPeople leave slow sites. That is the expensive part. The ranking penalty is real too, but the customers you never hear from cost more.
LCP, CLS, and INP measured and fixed, not guessed at.
Images, fonts, and scripts trimmed to what the page actually needs.
Set up so repeat visits are close to instant.
The slow database query or blocking script nobody profiled.
Real numbers on both ends, so you can see what you bought.
Speed decays as content is added. We watch for it.