Prefer calculation from actual time rather than increment set*
#486
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Fixes #484
I have avoided worker based solutions as written as #484 (comment).
The choice is actual duration based, I guess it
reduces
the differences even in background tabs. (Should not be perfect.)https://stackoverflow.com/a/5927432/1212807
I hope background tasks should not take high power. So I hope this resolves the issues...
@pankona Could you review? (I didn't check long time run.)