[Webkit-unassigned] [Bug 157203] New: Typing is really slow when there are many input text fields on the page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157203

            Bug ID: 157203
           Summary: Typing is really slow when there are many input text
                    fields on the page
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcdado at gmail.com

When there is a huge amount of input fields on a page, the typing performance is very bad. Such pages do exists, for example string translation backends with collapsable fieldsets for each single set/page to translate. In this cases the PHP backend even needs to increase the max_input_vars.

I created a page that shows how even on a current MBP Retina, performance is terrible. https://gist.github.com/mcdado/35d8ccb3d5c165c28ed6f70ffca68948

Also, after a while fans start spinning up and they wind down only when the backlog of typed characters are displayed. I made a video here comparing performance with latest Firefox 48, Chrome 50, and Safari Technnology Preview 3: http://cl.ly/0v1g3a3P3h3o

I hope this helps!

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