Lab
Main Thread Jam
Tap the target while a long task blocks the page, then split the task into small chunks and feel how much faster the page responds.
Tap the highlighted square 15 times. Play once with no long task, then add one and play again. Turn on “Split into 10 ms chunks” to see how yielding helps.
- Taps
- 0/15
- Last
- –
- INP
- –
Response time here runs from your tap to the next painted frame. INP is the slowest response in a visit: good is 200 ms or less, poor is over 500 ms.