[Webkit-unassigned] [Bug 150445] New: Flexbox - flex direction column slow layout performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150445

            Bug ID: 150445
           Summary: Flexbox - flex direction column slow layout
                    performance
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scottbobertson at gmail.com

Nested divs with 'display: flex' and 'flex-direction: column' have very slow performance in Safari.

At a depth of 18 divs with these CSS properties Safari takes a total of 6578ms to layout and paint the divs this time grows exponentially as the depth of divs increases. This same test performed on Chrome or Firefox takes 2ms.

Here is a demo of the problem. (open the console to see the results)

http://codepen.io/anon/pen/zvRKYN?editors=001

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