[Webkit-unassigned] [Bug 191197] New: SVG filters crash on iOS and are slow in general

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191197

            Bug ID: 191197
           Summary: SVG filters crash on iOS and are slow in general
           Product: WebKit
           Version: Safari 12
          Hardware: All
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jan.boesenberg at incors.com
                CC: zimmermann at kde.org

Created attachment 353709

  --> https://bugs.webkit.org/attachment.cgi?id=353709&action=review

Test case for filter performance

A simple SVG using filters may crash on Safari iOS and is very slow.

To reproduce the issue open the attached test case or follow this link:   https://codepen.io/anon/pen/eQOxKE

With each cycle the test adds a clone of an SVG to the document. The SVG consists of a rect which has a filter applied.

It crashes after ~10 cycles on iPhone 4s, ~35 cycles on iPhone X and ~80 cycles on iPhone SE. On Safari desktop it is easily five times slower than Chrome, maybe comparable to Internet Explorer 11.

More notes:
- The same problem occurs if one SVG is created with multiple filtered rect elements, even if the same filter is applied to all elements.
- It does not matter what the filter does, even an empty filter containing only <feOffset /> gives the same result.
- I could not reproduce the crash with masks, so there seems to be a difference (although better performance on masks would not hurt)

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