Turn a Waterfall Into an LCP Fix
Interpret a waterfall and choose an LCP fix that targets resource load delay.
The product detail page has LCP at 4.4 seconds even though the hero image is already compressed to 160 KB. Identify the LCP element, align it to the request waterfall, fix the largest subpart, and verify that exact subpart improves. The common trap is to keep compressing the hero image because it is visible and familiar, while the request still starts late because JavaScript reveals it after hydration. 1. Identify element Use the trace LCP marker to confirm the hero product image is the LCP element. Without the element, the team is optimizing a metric label instead of the thing…
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