[Webkit-unassigned] [Bug 218348] New: REGRESSION (r254038): Simple.com money transfer UI is very laggy (multiple seconds per keypress)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218348

            Bug ID: 218348
           Summary: REGRESSION (r254038): Simple.com money transfer UI is
                    very laggy (multiple seconds per keypress)
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thorton at apple.com

Created attachment 412666

  --> https://bugs.webkit.org/attachment.cgi?id=412666&action=review

repro the bug

Steps to Repro:

simple.com -> Move Money -> “Transfer to or from a bank”

The animation when it transitions in is very slow, and every keypress is very slow.



The attached reduction shows the problem: the Date constructor is - in some cases - 20-30x slower now than it used to be, and Simple is calling it a /lot/.

ggaren says that we're always missing the Date cache, and that adding a Z to the end of the string makes you go fast again (I'll attach a "fixed" version of the repro case too).

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