What is the "Slow FCP (mobile)" check?

P1 · HighPerformance

Slow FCP (mobile)

First Contentful Paint slow on mobile viewport

Code: mobile_slow_fcp

Why it matters

First Contentful Paint slow on mobile viewport. Slow experiences increase bounce rates and hurt Core Web Vitals scores. Google uses these metrics as a direct ranking signal.

Related checks in Performance

Slow First Contentful Paint

FCP exceeds 3 seconds

FCP needs improvement

FCP between 1.8-3 seconds

Slow Largest Contentful Paint

LCP exceeds 4 seconds

LCP needs improvement

LCP between 2.5-4 seconds

Poor Cumulative Layout Shift

CLS exceeds 0.25

Run a free scan to check your site

Get a complete audit in under 2 minutes. No account required.

Start Free Scan