Performance check
The page responds to input quickly
Total Blocking Time, the lab stand in for Interaction to Next Paint.
medium severityperf.tbt
Run this check on your site
Runs just this check in quick mode. The report opens with the evidence and the fix.
Why it matters
A page that blocks the main thread feels frozen. Long tasks are usually caused by heavy scripts running during load.
How to fix it
Split long tasks, defer scripts that are not needed for the first view, and reduce the amount of JavaScript the page ships.
The details
- Category
- Performance
- Severity of a failure
- medium
- Confidence
- medium
- Needs a browser
- Yes
- Check id
- perf.tbt