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  1. #1
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    Jul 2010
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    Exclamation [4.x] Serious performance issues under IE 8

    Originally posted here earlier today :

    Update, using EXTJS Example "EXTJS Theme" as the test case.

    I’m seeing serious performance issues under IE 8 using 4.0.0

    Using Chrome, EXTJS is lightning fast! (much faster than in EXTJS 3.3)

    Using FF 3.6, performance is not far off Chrome but I’m seeing a little performance degradation when layouts get more complex.

    Using IE 8, large layouts/apps are basically unusable.

    I've tried other Machines (VM's and Physical) and I'm still seeing the same performance problems under IE 8.

    See attached video...
    Part 1: EXTJS Theme running under 3.3 (8 seconds load time)
    Part 2: EXTJS Theme running under 4.0.0 (33 seconds load time)

    Hope this helps.
    Attached Files