Generic thresholds are not one-size-fits-all. Google's LCP threshold is 2.5s. But for this site, conversion rate drops after 1.1s. By 2.5s, the site is on the #webperf plateau.

This is why you need your own user data to set #pagespeed and #ux goals. How it works: https://www.speedcurve.com/blog/site-speed-business-correlation/