[Webkit-unassigned] [Bug 139634] New: Several fast/selectors tests are very slow in debug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139634

            Bug ID: 139634
           Summary: Several fast/selectors tests are very slow in debug
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: benjamin at webkit.org, cdumez at apple.com

These tests are so slow that that they frequently time out on bots an locally, especially when other tests run in parallel using hyper-threading.

fast/selectors/matches-backtracking.html took 44.6 seconds
fast/selectors/nth-child-of-register-requirement.html took 24.3 seconds
fast/selectors/not-backtracking.html took 23.5 seconds

This one may or may not have the same root cause, I imagine that jquery does a lot of CSS selector matching.

jquery/manipulation.html took 23.0 seconds

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