Bug 1437215 landed a few hours ago, which finally gives us AWSY numbers on windows. We only have a few data points so far, but assuming they're representative, we have some work to do. I graphed both Resident and Explicit [1]. Resident: 457MB Fx, 788MB FxWR Explicit: 296MB Fx, 337MB FxWR So explicit memory is a small regression, and resident memory is quite a large one. I'm guessing a good chunk of the resident memory regression is in the driver, and may correspond to increased VRAM usage. One wrinkle that makes this not quite apples-to-apples is that the QR tests run on real hardware, but the non-QR tests are virtualized [2]. This may or may not account for some of the different, but probably doesn't account for all of it. [1] https://treeherder.mozilla.org/perf.html#/graphs?timerange=5184000&series=mozilla-central,1784207,1,4&series=mozilla-central,1653930,1,4&series=mozilla-central,1655658,1,4&series=mozilla-central,1784217,1,4 [2] https://hg.mozilla.org/integration/autoland/rev/f44fb4c2bbde

(In reply to Bobby Holley (:bholley) from comment #0) > One wrinkle that makes this not quite apples-to-apples is that the QR tests > run on real hardware, but the non-QR tests are virtualized [2]. This may or > may not account for some of the different, but probably doesn't account for > all of it. I did a try push [1] with the non-QR tests on 'hardware' virtualization to get a sense of how much of the difference comes from that. There's some differences [2] which seem a little random. I'm doing more retriggers to see if they are consistent. [1] https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=070b2bbb08bd6a9c6aa062ba0578585df29aca95 [2] https://treeherder.mozilla.org/perf.html#/compare?originalProject=mozilla-central&newProject=try&newRevision=070b2bbb08bd6a9c6aa062ba0578585df29aca95&framework=4&showOnlyComparable=1&selectedTimeRange=172800

WR is now a ~7% win over non-WR on AWSY resident [1]. \o/ [1] https://treeherder.mozilla.org/perf.html#/graphs?series=mozilla-central,1784207,1,4&series=autoland,1654924,1,4&series=mozilla-inbound,1784157,1,4&series=mozilla-central,1653930,1,4&series=autoland,1784047,1,4