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Probably it's obvious but I can't find an answer..
What's the exact meaning of idle in this case? Is there really nothing going on? Or just no JavaScript getting parsed/executed?
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The "Idle" state occurs when the browser has not yet completed the final rendering of the page on the screen but must put the process on hold while waiting for missing data or resources needed to resume and complete it.
To access the Performance tab, navigate to the website you want to profile, then open Chrome DevTools by right-clicking and selecting Inspect. Select the Performance tab inside Chrome DevTools. The easiest way to capture a performance profile is by clicking the Start profiling and reload page icon.
# Open the Issues tab Open DevTools. Click the Go to Issues button in the yellow warning bar. Alternatively, select Issues from the More tools menu. Once you're on the Issues tab, click the Reload page button if necessary.
The meaning of "idle" is really obvious: "(idle)" means the time spent on doing nothing.
Go to about:blank, and get a new CPU profile. The result is probably a value for (idle) close to 100% and a bit of (program) next question: Chrome debugger - What is "(program)" in the profiler?.
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