[Webkit-unassigned] [Bug 264654] New: Don't make the decision to cache a DisplayList for a TextRun depend on the rendering update frame rate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264654

            Bug ID: 264654
           Summary: Don't make the decision to cache a DisplayList for a
                    TextRun depend on the rendering update frame rate
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Currently, caching a DisplayList for the TextRun happens only if the last 30 frames happened in about a second. If the frame rate is lower than 30 FPS, we prevent the caching. The assumption is any animation should be faster than 30 FPS.

So when the frame rate is low, we make it even worse by preventing the caching. The caching should happen if the same TextRun is displayed very often (say >= 20) regardless of the current frame rate.

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