Smashing Magazine

APRIL 19, 2021

Total Blocking Time (TBT) is a good proxy for FID when using a testing tool without any direct user interaction, but also keep an eye on Time to Interactive (TTI) when looking at FID. not to mention older browsers (Internet Explorer — hurry up and fade out would you!) Cumulative Layout Shift (CLS). CrUX is Chrome only.

Google 140

Google Metrics Mobile Analytics 140

Smashing Magazine

JANUARY 7, 2019

Good for measuring and tweaking rendering performance, but not so good for measuring when important content appears and can be interacted with. Custom metrics measure a particular, custom event for the user, e.g. Twitter’s Time To First Tweet and Pinterest’s PinnerWaitTime. Steve Souders has a detailed explanation of each metric.

Performance 103

Performance Cache Metrics Network 103

Smashing Magazine

JANUARY 11, 2021

In the end, it’s not the load events or server response times that define the experience, but the perception of how snappy the interface feels. Good for measuring and tweaking rendering performance, but not so good for measuring when important content appears and can be interacted with. What does it mean?

Performance 145

Performance Cache Media Metrics 145

Smashing Magazine

JANUARY 6, 2020

In the end, it’s not the load events or server response times that define the experience, but the perception of how snappy the interface feels. Good for measuring and tweaking rendering performance, but not so good for measuring when important content appears and can be interacted with. What does it mean?

Performance 145

Performance Cache Network Metrics 145