[Webkit-unassigned] [Bug 200456] New: [results.webkit.org Timeline] Performance improvement - Skip render offscreen canvas

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200456

            Bug ID: 200456
           Summary: [results.webkit.org Timeline] Performance improvement
                    - Skip render offscreen canvas
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhifei_fang at apple.com

Using intersection observer to observe if a series on display on viewport, if it is, we do the render, if not, we just skip the render.

This limited the number of frame we requested for rendering, save huge resources for nested expand series as well.

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