(In reply to Alice0775 White from comment #11) > (In reply to G from comment #10) > > This is somewhat fixed in the latest Nightly, scrolling past the very bottom iframe full of boxes has no jank but scrolling past the top one still does lag on my machine. > > https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transforms/Using_CSS_transforms#result > > Yes, Bug 1749380 improved the scrolling performance for the very bottom iframe example. However, still slow(jank) for the middle one. This improvement by Bug 1749380 seems to have been spoiled by Bug 1757002 . Scrolling has worsened again. I will file a new bug for this.
Bug 1750728 Comment 17 Edit History
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(In reply to Alice0775 White from comment #11) > (In reply to G from comment #10) > > This is somewhat fixed in the latest Nightly, scrolling past the very bottom iframe full of boxes has no jank but scrolling past the top one still does lag on my machine. > > https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transforms/Using_CSS_transforms#result > > Yes, Bug 1749380 improved the scrolling performance for the very bottom iframe example. However, still slow(jank) for the middle one. This partial improvement by Bug 1749380 seems to have been spoiled by Bug 1757002 . Scrolling has worsened again. I will file a new bug for this.