FYI: Changes to materialized FCP and TTFB thresholds

[Rick Viscomi]

Hi everyone,

This is just a quick notice that the materialized country/device/metrics summary tables on BigQuery have been updated to use new thresholds.

TTFB

• fast: 500ms (previously 200ms)
• slow: 1500ms (previously 1000ms)

FCP

• fast: 1500ms (previously 1000ms)
• slow: 2500ms (previously 3000ms)

As a result, you may see shifts in your distributions if you're looking at FCP data in the CrUX Dashboard or other summary tools that depend on materialized data. The user experiences themselves have not changed, only the way we categorize them.

Let me know if you have any questions.

Rick