I updated the query in comment 0.
Bug 1475518 Comment 6 Edit History
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I updated the query in comment 0 [1]. It still shows the low-commit-space-situation is the highest. Looking at per-process view [2], the main process shows the biggest number. [1] https://sql.telemetry.mozilla.org/queries/79144#196656 [2] https://sql.telemetry.mozilla.org/queries/79145#196658