I doubt this is a recent issue and/or related to performance graphs. TaskQueue with very short countdown were always very flaky so say the least. I routinely saw tasks with countdown=0 lagging by a 1 min or so. This is since years ago. Especially tasks which are scheduled from other tasks, not frontend requests. I filed some tickets but never gotten anything resolved. You can find and star my feature request to provide TQ with accurate timing. Though do not get your hopes high.
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