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Slow first paint (FCP)

performance.cwv_fcp_slow
Priority
Low
Severity
Warning

What we look for

In Google's PageSpeed Insights test (one lab load of each page), these pages took more than 3 seconds to show their first text or image, a measure called FCP (First Contentful Paint).

Why it matters

Until something appears, visitors see a blank screen and may give up. FCP is not a Core Web Vital, but a slow one usually delays the main content too.

How to fix

Remove or delay the scripts and styles that hold up drawing, in the page template or plugin settings, and speed up the server's first response, for example with caching.

What it cannot know

This is one lab load per page, run on Google's servers. Real visitors' times can differ.

Where you’ll see it

The id is stable, and every surface uses it, so it’s the thing to search for or hand to an agent.

Terminal
When it is one of the five findings under Fix first, raptor crawl prints the id under it.
Check: performance.cwv_fcp_slow
crawl.json and the CSV
The crawl JSON names the finding by this id, and so do the CSV and raptor_query.
"check_id": "performance.cwv_fcp_slow"
The HTML report
This link opens the finding in the report, and each finding shows its id.
crawl.html#finding=performance.cwv_fcp_slow
MCP
raptor_findings with this check_id returns the finding in full, with a fix brief ready to paste into a task. If it didn’t fire, it says why.
raptor_findings {
  "job_id": "...",
  "check_id": "performance.cwv_fcp_slow"
}