Unverified50% confidenceFactExact time
phys_footprint is a process-level memory metric that macOS exposes through libproc, and it is what the Memory column in Activity Monitor displays; it is an estimate of 'physical pages that are actually resident and counted toward system memory pressure', excluding the portion swapped out to swap, so under a unified memory architecture it falls rapidly when pages are marked as compressible or enter swap.
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Long-term
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10/13/2026
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