Understanding Regional / Device Differences in CrUX

Purpose

Explain why CrUX metrics can differ by device and region, and how to interpret those differences.

Why results differ

Real user experience depends on:

• Device performance (CPU and memory)
• Network quality
• Geography and distance to servers
• Browser and OS mix

That means p75 LCP or INP can look different across segments even for the same site.

How CrUX segments data

CrUX reporting commonly includes:

• Device form factor (mobile, desktop, tablet)
• Geography where available

Google reference:

• CrUX overview https://developer.chrome.com/docs/crux/

How to use these differences

• Use mobile and desktop as separate baselines.
• Watch for changes that affect one segment more than the other.
• Avoid assuming a single number represents every visitor.

Related pages

• What Is CrUX (Chrome UX Report)?
• CrUX vs RUM: When to Use Each
• Common Misreads of Performance Data (and How to Avoid Them)