[Webkit-unassigned] [Bug 239856] New: [GTK] Certain page kills CPU, media playback kills the page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239856

            Bug ID: 239856
           Summary: [GTK] Certain page kills CPU, media playback kills the
                    page
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Performance
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcrha at redhat.com
                CC: bugs-noreply at webkitgtk.org

This is with 

   webkit2gtk3-2.36.0-1.fc36.x86_64
   epiphany-42.0-1.fc36.x86_64

but reproduced also with the MiniBrowser, thus filling here.

Open: https://finance.yahoo.com/quote/TSLA?p=TSLA

You'll be asked for cookies, I simply disable everything, which is two-clicks task here - thank you Yahoo!.

Two problems:
1) after the page loads see the graph and keep the page staying; enjoy a WebKitWebProcess chewing your CPU.


2) scroll lower on the page - there's a video;
   - epiphany has an "autoplay without sound" by default, unless you
     happen to disable it earlier, once the video loads the page freezes, completely;
     I tried to Deny autoplay, but it didn't help, the page froze anyway.

   - Minibrowser - claims missing H.264 (High Profile) decoder. - keep the message
     there and scroll lower on the screen, until the video is shown and it begins loading;
     wait several seconds, once CPU calms down the page is frozen. I moved even lower
     on the page, but I think the problem is once the video loads

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