[Webkit-unassigned] [Bug 94737] New: Editing and pasting long texts to textarea's overproportionally slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94737

           Summary: Editing and pasting long texts to textarea's
                    overproportionally slow
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InChromiumBugs, NeedsRadar, NeedsReduction
          Severity: Normal
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: adele at apple.com, ap at webkit.org, tony at chromium.org,
                    tkent at chromium.org, enrica at apple.com


I thought Enrica had fixed this a while ago... Maybe it has regressed or that we need to make it even faster?

http://code.google.com/p/chromium/issues/detail?id=109587

1. Open any page with a decent textarea
2. Paste a text about 1MB or more
3. wait

What is the expected result?
a fast reaction

What happens instead?
Browser stalls for some time overproportionally depending on text length it seems. This takes much longer than on competing browsers eg. firefox even though the overall experience is a lot faster on chromium on my system.

----

I'm attaching a sampling result with Safari.
How to reproduce:
 1. Open repro.html in Comment 4 with Safari + Debug-built WebKit
 2. Focus on the textarea
 3. ⌘-A, ⌘-C
 4. Press Down cursor to go to the end of the editing area
 5. Start sampling
 6. ⌘-V
 7. Wait for re-blinking the caret
 8. Stop sampling

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