[Webkit-unassigned] [Bug 180929] New: REGRESSION (r225789): 35% regression in cold time-to-first-load by enabling service workers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180929

            Bug ID: 180929
           Summary: REGRESSION (r225789): 35% regression in cold
                    time-to-first-load by enabling service workers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thorton at apple.com

Created attachment 329646

  --> https://bugs.webkit.org/attachment.cgi?id=329646&action=review

test app

Steps to Reproduce:

1. Run the attached test app.
2. Revert r225789.
3. Run the attached test app again.

Expected: Relatively similar results.
Actual: GlobalCold Navigation Time goes up by 35% (for me, ~330ms -> ~450ms)

This measures the time it takes to load about:blank in the first WKWebView in a given UI Process. Other metrics (subsequent views, etc.) don't similarly go up, so this has to be a fixed one-time cost of some sort. I haven't looked at traces yet.

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