[4.x] Serious performance issues under IE 8

Originally posted here earlier today : http://www.sencha.com/forum/showthre...ues-under-IE-8

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.

I would try running IE8 in No Add-ons mode to be certain no toolbars/addons are affecting load times.

Quote:

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Originally Posted by latenightcoder

I would try running IE8 in No Add-ons mode to be certain no toolbars/addons are affecting load times.

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Thanks for the suggestion but I’ve already tested IE on other machines (fresh installations without any add on’s).

The only thing I've not tried (but will later today) is hosting EXTJS 4.0.0 on a different system. I could be an issue with Tomcat, however with Chrome and FF working fine against that box, I’m not hopeful.

We hade similar issues... restart IE and don't start the developertool.. that solved it for us.. IE8 developer tool seems to mess things up sometimes..

I’ve spent a number of days looking at this and unfortunately I've been unable to isolate the IE performance issues to anything other than the new EXTJS Framework.

In brief I've tried the following.

Running IE 7/8 on my local host and against ETXJS 4.0 and 3.3 installed locally (my dev box)

Code:

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Existing installation of IE 8 > 4.0 > major performance issues
Existing installation of IE 8 (with Add on’s disabled) > 4.0 > major performance issues
Fresh installation of IE 8 > 4.0 > major performance issues

Existing installation of IE 8 > 3.3 > no performance issues
Existing installation of IE 8 (with Add on’s disabled) > 3.3 > no performance issues
Fresh installation of IE 8 > 3.3 > no performance issues

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Running IE 7/8 on various VM’s and physical boxes against ETXJS 4.0 and 3.3 installed on my dev box

Code:

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Fresh installation of IE 7 > 4.0 > major performance issues
Fresh installation of IE 8 > 4.0 > major performance issues
Fresh installation of IE 8 > 3.3 > no performance issues

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Running IE 8 on my local host and against ETXJS 4.0 hosted by Sencha

Code:

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Existing installation of IE 8 > 4.0 > major performance issues
Existing installation of IE 8 (with Add on’s disabled) > 4.0 > major performance issues
Fresh installation of IE 8 > 4.0 > major performance issues

---

Running IE 7/8 on various VM’s and physical boxes against ETXJS 4.0 hosted by Sencha

Code:

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Fresh installation of IE 7 > 4.0 > major performance issues
Fresh installation of IE 8 > 4.0 > major performance issues

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Is no one else seeing issues with IE?

IE9 doesn't perform well at all for me...

Is there anyone that is running IE with extjs 4.0 that is seeing acceptable performance (ie similar to 3.3.3)?

Yes, performance on IE & FireFox is just terrible, especially grids. Chrome is OK.

ie8 is terrible with extjs4, a compete change from ext3... most of the world or customers use ie... so would someone look into using reals apps on ie8 not just the simple examples from the examples page

I've found IE8 to be usable, EXCEPT using grid panels with forceFit set TRUE - if I do that, when my store loads, it's 10 seconds or more until my verticalpaging scroller appears. If I set forceFit FALSE, it's less than 1 second.

stevil