A delay on the fade was added in bug 1401682 to avoid a tart regression. But that talos test is using about:newtab and not about:home, so we can apply the delay only there.
Comment on attachment 8915692 [details] Bug 1406120 - Remove fade delay for about:home. https://reviewboard.mozilla.org/r/186902/#review191954
Attachment #8915692 - Flags: review?(khudson) → review+
We're sorry, Autoland could not rebase your commits for you automatically. Please manually rebase your commits and try again. hg error in cmd: hg rebase -s 62a443b0d56b -d eaa0d99df029: rebasing 424371:62a443b0d56b "Bug 1406120 - Remove fade delay for about:home. r=k88hudson" (tip) merging browser/extensions/activity-stream/install.rdf.in warning: conflicts while merging browser/extensions/activity-stream/install.rdf.in! (edit, then use 'hg resolve --mark') unresolved conflicts (see hg resolve, then hg rebase --continue)
Pushed by email@example.com: https://hg.mozilla.org/integration/autoland/rev/eb855465eb9c Remove fade delay for about:home. r=k88hudson
Comment on attachment 8915692 [details] Bug 1406120 - Remove fade delay for about:home. Approval Request Comment [Feature/Bug causing the regression]: Talos tart regression fix from bug 1401682. Blocks tracking-firefox57 blocking bug 1399961. [User impact if declined]: Users forced to wait before seeing most of about:home content making Firefox feel slow. See https://ed.agadak.net/as/57%20uplift.webmhd.webm [Is this code covered by automated tests?]: No [Has the fix been verified in Nightly?]: Yes, 20171007100142 [Needs manual test from QE? If yes, steps to reproduce]: No [List of other uplifts needed for the feature/fix]: This bug after bug 1406096 [Is the change risky?]: No [Why is the change risky/not risky?]: The change is css removing the transition-delay [String changes made/needed]: Nope [Perf win]: From video above, before the content starts showing on average 4.25 frames (30fps) = 141ms after the localized text appears, and after the content starts showing on average 0.2 frames = 6ms. A 23.5x (2350%) improvement.
Attachment #8915692 - Flags: approval-mozilla-beta?
Comment on attachment 8915692 [details] Bug 1406120 - Remove fade delay for about:home. Fix targeting perf improvement, Beta57+
Attachment #8915692 - Flags: approval-mozilla-beta? → approval-mozilla-beta+
Component: Activity Streams: Newtab → New Tab Page
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