[22:36:30] first paint p75 dropped by more than 100ms over the past few days, an absolutely massive win, and I see similar movement in other navigation timing metrics [22:38:07] what is the cause? I don't think it can be the CPU frequency governor change because most page views don't hit the app servers at all [22:39:47] my best guess is it's vgutierrez's https://gerrit.wikimedia.org/r/c/operations/puppet/+/828002 [22:40:52] based on https://phabricator.wikimedia.org/T316338#8205843 : "As a direct result cache hitrate shows up to a 100% increase in the text cluster at the ats layer" [22:45:45] I'm not sure if the timing lines up though