Success! Looks like we've fixed this one. According to our records the fix was applied for EXTJS-6481 in a recent build.
  1. #21
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    It's an ExtJS Issue, since it's present in it's severe form only in ExtJS - other JS frameworks that can display huge tables don't have this problem.

  2. #22
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    i've changed the firefox set up like i said and it's working great...i don't know for sure why but it's working.

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    this has been fixed in extjs4.1.1

  4. #24
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    I was using ext js 4.1.1 when I had this problem ...

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    hm,
    very interesting, because for me this problem has gone after upgrading to 4.1.1

  6. #26
    Sencha - Ext JS Dev Team evant's Avatar
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    4.1.1 has some improvements to optimize how the scroll synchronization works, however enabling smooth scrolling still introduces a bit of lag, there's not a whole lot we can do about it.
    Evan Trimboli
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    Don't be afraid of the source code!

  7. #27
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    Hi guys, while upgrading project to ExtJs 4.1.1a version, I discovered that grids scrolling and general performance is pretty low. In my case it was reproduced only on my Windows 7 PC on Firefox 18.0.2. Problem is connected to enabled "hardware acceleration". In 18.0.2 version "hardware acceleration" is enabled by default. When I turn it off, performance increased a lot. Issue with firefox was solved in firefox 19 beta, grid performance is much better.

    But after check on other PCs, I found the same issue on OS X 10.8.2 Build 12C3006, Safari Version 6.0.2 (8536.26.17).

    Checked ExtJS 4.2.x beta, grid performance is on the same level.

    When you check the same grids in 3.x version, performance is fine.

    Issue is not related to my application, as the same speed of scrolling is in extjs examples http://cdn.sencha.com/ext-4.1.1a-gpl...l-editing.html. Checked it Windows 7 firefox 18.0.2 and OS X 10.8.2 Build 12C3006, Safari Version 6.0.2 (8536.26.17)

    Before writing this post I've made pretty big research, as I can not upgrade to 4.x version until grid scrolling is fixed. Maybe someone knows any improvements, that sencha team can advice? or should we expect better performance in next versions?
    Stanislav Golovenko.

    My extentions:
    Slider Button
    Desktop Icon Manager

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