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    Success! Looks like we've fixed this one. According to our records the fix was applied for EXTJS-6481 in a recent build.
  1. #1
    Ext JS Premium Member mcouillard's Avatar
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    Exclamation Firefox 13 new default smooth scrolling leads to very slow grid scrolling

    Firefox 13 new default smooth scrolling leads to very slow grid scrolling


    • Ext 4.1
    • Stateful Array Grid Example
    • Windows 7 32bit
    • Firefox 13 stable (just released automatically)
      • Options > Advanced > Use Smooth Scrolling - was automatically checked true by the upgrade
    Scroll any grid panel - you move pixel by pixel! Very, very slow. If you turn off the above default option, scrolling returns to it's normal snappy self.

    I honestly can't say if this is a bug in Firefox 13 (it didn't happen in 12) or if it's related to ExtJS.

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    Sencha - Community Support Team jsakalos's Avatar
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    Hmm, I cannot observe this on Lion@MacBook Pro FF13, probably it is Win specific. I can move this thread to bugs so that the developer can take a look and sort out if it is an Ext bug or a Firefox bug.

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    I can confirm this bug using 4.1 on Windows XP Pro.

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    I also confirm the same behavior using 4.1 and FF 13.0 on Linux.
    Manually unchecking "smooth scrolling" fixed the issue.

  5. #5
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    i can confirm this bug, too.
    using ext js 4.1 with linux (ubuntu) and firefox 13. this didn't happen before the upgrade from firefox 12 to 13.

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    I can confirm this too. It's not just the Grid scrolling, but all scroll bars in an ExtJS 4.1. application got much slower .

    Thanks in advance.

  7. #7
    Sencha Premium Member karlsnyder0's Avatar
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    We have just observed this issue also in Firefox 13. Chrome and IE are happy but Firefox is very sluggish.

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