taste-web-performance

Speed is part of the design. A hero that paints in 900ms with a shifted headline is a broken hero.

1. THE BUDGETS (Write These Down First)

Target p75 on mobile hardware (the median phone, not your Mac):

LCP < 2.5s — the hero text or hero image must be the largest contentful element and must paint fast.
CLS < 0.1 — no element moves after it's first painted. Every font, image, and ad-sized box is a CLS risk.
INP < 200ms — no click waits on a long task; no JS does heavy work on the main thread at interaction time.
Total page weight ≤ 1.5MB for a marketing page; a "simple" page should ship under 500KB.
State the budget in the build notes — a page without a stated budget is a page without a plan.