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Thread: [4.x] Serious performance issues under IE 8

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  1. #21
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    Some additional data points. Within same IE instance (different tab). Here are the reload times:

    http://localhost/ext-4.0.0/examples/themes/index.html
    5.3 s

    http://localhost/ext-3.3.3/examples/themes/index.html
    1.8 s


    Also, changing the 'theme' via the dropdown is dramatically different. Under 3.3.3 it's almost instantaneous but under 4.0.0 it takes as long as a complete reload.

  2. #22
    Ext JS Premium Member stevil's Avatar
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    Just watch IE8's Profiler while working with a grid tied to a buffered store (perhaps a grid that's larger than the little widget in the examples - try one that takes 1/2 the screen)... a LOT of my lag time is spent in onHeaderResize in IE8

  3. #23
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    I have the same problem on Theme samples, using IE8 (no addons).

    Changing the theme from the default one to the accesibility one:

    ExtJS4: 20s
    ExtJS3: 0,5s

    Using the IE8 profiler you can clearly see the methods that take a really long time while using v4.

  4. #24
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    Changing themes in ExtJS4 actually loads a different html page (index-access.html), hence a complete reload. This does not occur with ExtJS3 so this particular comparison is apples to oranges...


    Quote Originally Posted by VT-TizianoF View Post
    I have the same problem on Theme samples, using IE8 (no addons).

    Changing the theme from the default one to the accesibility one:

    ExtJS4: 20s
    ExtJS3: 0,5s

    Using the IE8 profiler you can clearly see the methods that take a really long time while using v4.

  5. #25
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    IE9 has similar performance issues as IE8: Within same IE instance (different tab). Here are the reload times for IE9:

    http://localhost/ext-4.0.0/examples/themes/index.html
    4.5 s

    http://localhost/ext-3.3.3/examples/themes/index.html
    1.8 s

  6. #26
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    Exclamation Is this being tracked

    i wanted to buy license today, but i am not feeling too good about the product change while reading this thread,
    I would expect a serious involvement of Sencha team - most of our customers are IE and i cannot have them being impacted to that extent

  7. #27
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    Default Where do we go..?

    We are also struggling with the performance of the Sencha 4 Grid in IE. With more than 250 rows it becomes unusable.

    We implemented Buffered Grid which made the performance acceptable but then the selection didnt work per the thread below:
    http://www.sencha.com/forum/showthre...-buffered-grid.

    Anyone have and workarounds?

    Thanks in advance.

    Rich

  8. #28
    Sencha User tolstoj's Avatar
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    This is seriously bad news...

  9. #29
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    @evant The issue isn't IE vs other browsers, it's ExtJS 4 vs Extjs 3.3 on IE (8 or 9). There appears to have been a significant performance degradation in ExtJS 4.

    So far, in the 1 week that this bug rpt has been open, there has been no real response from Sencha. I'm getting concerned, but trying to be patient...


    Quote Originally Posted by evant View Post
    No, unless you've explicitly set useDom to be true.

    I don't really notice much difference when loading the examples. Obviously IE is slower than Chrome/FF because it's an inferior browser, but I'm not seeing anything like the 30 second load times you've mentioned. Seems like other users (above) haven't been able to either.

  10. #30
    Ext JS Premium Member stevil's Avatar
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    @rich02818 Although I would say all browsers have some issues. Even in Chrome, a buffered store grid panel in a center region of a full screen layout takes 1.5 seconds on a core i7-840 between the time the store loads, mask disappears, and the scrollbar appears. If I turn off forceFit, and/or don't try to flex the columns, it's relatively OK. I'm sorry, the scrollbar should just BE there.

    stevil

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