<b>Why fixes take 28 days to show up in your score</b>

<b>Why fixes take 28 days to show up in your score</b>

You push a great fix, retest the next morning, and the field score hasn't moved. Before you panic: this is expected, and the reason is the 28-day window.

Google's real-visitor data (CrUX — Chrome User Experience Report) reports a <i>rolling 28-day average</i>. The day after your fix, 27 of those 28 days are still 'old slow you'. Your improvement is in there, just heavily diluted.

Think of it like adding fresh water to a murky tank — it clears gradually as old water cycles out, not in one splash.

How to stay sane while you wait:
— Confirm the fix in <b>lab data</b> immediately — that updates instantly
— Watch the field score creep up over the following weeks
— Expect roughly four weeks for the full picture

<b>Try this:</b> Right after deploying, screenshot your lab score as proof the fix worked, then set a calendar reminder for 28 days to check the real-visitor number. Patience is part of the job here.