[Webkit-unassigned] [Bug 193703] New: Browser hangs on opening an SVG with Bezier curves and dash lines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193703

            Bug ID: 193703
           Summary: Browser hangs on opening an SVG with Bezier curves and
                    dash lines
           Product: WebKit
           Version: Safari 12
          Hardware: PC
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wteric at hotmail.com
                CC: zimmermann at kde.org

Created attachment 359833

  --> https://bugs.webkit.org/attachment.cgi?id=359833&action=review

TheSlowSVGInSafari.html

I have extracted the problematic SVG image into a test page (see attachment TheSlowSVGInSafari.html). It can repro easily opening this file in Safari: Moving the mouse over the title will trigger some animation effects on the SVG image displayed below. You will see that every time when the mouse moves over the tile, the page becomes extremely slow, the animation shows up frame by frame, very junky. Opening the timeline recorder dev tool in Safari, you will notice that most of the time is spent doing Composite/Pain in the page.

Tried the same file on all other types of browsers (Firefox, Chrome, Edge, IE on MacBook or Windows), this problem only happens in Safari.

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