Krinkle added a comment.
From Grafana: WebPageReplay dashboard <https://grafana.wikimedia.org/d/000000572/webpagereplay-drilldown?orgId=1&from=1564498800000&to=1564750800000&var-wiki=enwiki&var-device=desktop&var-browser=chrome&var-latency=100&var-page=Sweden> F29939577: capture.png <https://phabricator.wikimedia.org/F29939577> The last two grey vertical lines indicate the (final) deployment of the 1.34-wmf.16 branch (it was attempted earlier that day as well and then reverted for unrelated reasons). From Grafana: WebPageTest dashboard <https://grafana.wikimedia.org/d/000000095/webpagetest-drilldown?orgId=1&from=1564607689632&to=1564750994460&var-wiki=enwiki&var-users=anonymous&var-page=Barack_Obama&var-location=us-east&var-browser=Chrome&var-view=firstView> we can see the bandwidth difference as well: F29939582: capture.png <https://phabricator.wikimedia.org/F29939582> 2 KB wouldn't normally have this much impact in JS payloads, but I believe it's able to have this impact because it's taken from the early startup module (less bandwidth taken from other requests, and less CPU time overall for the processing of all that data, which can instead be spent on rendering the page). TASK DETAIL https://phabricator.wikimedia.org/T203696 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Ladsgroup, Krinkle Cc: WMDE-leszek, alaa_wmde, Jakob_WMDE, Ladsgroup, gerritbot, Addshore, Aklapper, Krinkle, Jdforrester-WMF, Hook696, Daryl-TTMG, RomaAmorRoma, 0010318400, E.S.A-Sheild, darthmon_wmde, joker88john, DannyS712, CucyNoiD, Nandana, NebulousIris, Gaboe420, Versusxo, Majesticalreaper22, Giuliamocci, Adrian1985, Cpaulf30, Imarlier, Lahi, Gq86, Af420, Darkminds3113, Bsandipan, Lordiis, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, LawExplorer, Vali.matei, WSH1906, Lewizho99, Maathavan, _jensen, rosalieper, Jonas, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331, Jay8g
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