[Webkit-unassigned] [Bug 209733] New: [iPadOS] Regression: Scrolling and Toolbar lags in Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209733

            Bug ID: 209733
           Summary: [iPadOS] Regression: Scrolling and Toolbar lags in
                    Safari
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mehmet.sahin at gmx.net

iPadOS 13.4
iPad Pro ML3K2FD/A
Safari for iPadOS

Dear Webkit-Team,

I noticed, that Scrolling in Safari for iPadOS lags on my iPad Pro ML3K2FD/A. I noticed this first, because the Toolbar flickers, when it changes from collapsed to uncollapsed state.

Steps to reproduce:

1.) Visit a page
2.) Scroll to the end of the page (Toolbar is still collapsed)
3.) Now swipe just a little bit very short and fast up so that the Toolbar uncollapsed and you scroll a little bit up.

Actual Result: The Toolbar (Address Bar and Tab Bar) flickers and the scrolling lags.

I wanted to take a screencast via the build-in recorder. But when the recorder is on, then the issue goes away?! Not sure, but it seems that the iPad runs in a lower framerate or in a low-power mode, so that the scrolling issue appears. But when the screenrecorder is on and the ipad uses (maybe) more power, then scrolling works perfectly and there is no issue with the Toolbar.

I hope this helps or maybe this is already a known issue. Otherwise I can record a screencast with the phone and share it here then.

Just let me know it.

Thanks for your great work and kind regards
Mehmet

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