[Webkit-unassigned] [Bug 181269] New: Swipe Back gesture to previous page causes lag in rendering

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Jan 3 18:00:31 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=181269

            Bug ID: 181269
           Summary: Swipe Back gesture to previous page causes lag in
                    rendering
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cagdas at outschool.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 330426

  --> https://bugs.webkit.org/attachment.cgi?id=330426&action=review

iOS 10.3 video capture

This bug probably happens for single page web apps. I have attached 2 video shots for iOS 10.3 and iOS 11.1 to show the difference in behavior.

I can reproduce the issue at outschool.com:
- Go to https://outschool.com/online-classes
- Click one of the class images to see the class detail page
- Use swipe back gesture to go to previous page
- Previous page renders empty for a couple of seconds and then appears fully rendered

Other remarks:
- This issue does not happen on iOS 10.3. There is still a short freeze of full UI but more acceptable than the current situation on iOS 11.1
- This issue does not happen for websites which are not single page apps. Try news.ycombinator.com as an example.
- This issue does not happen when regular back button is used instead of swiping

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