[Webkit-unassigned] [Bug 168482] New: Very slow composite (~300ms) when rendering images over 6K px in width

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168482

            Bug ID: 168482
           Summary: Very slow composite (~300ms) when rendering images
                    over 6K px in width
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nemtsov at gmail.com

When adding (16 in the test below) images that have a width and height of 6k px, and then scrolling the container, the scroll will be very laggy. Timelines show that Composite duration was about 300ms.

The issue can be seen in the following jsFiddle:
https://jsfiddle.net/nemtsov/ad8a5ugz/

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