[4.x] Serious performance issues under IE 8

[EBS]

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

+1

[olof]

Has this bug been acknowledged by Sencha?

[MrSparks]

Has this bug been acknowledged by Sencha?

Not to date, which is a little surprising. Hopefully they are looking into it before commenting....

[stevil]

a VERY well done example, IMHO, is here http://www.sencha.com/forum/showthre...ce-degradation

stevil

[MrSparks]

I've spent more time analysing 3.3.1 vs 4.0.0 and the results are not looking great for 4.0.0 across any browser.

System 1
Dual Core Xeon - 2.5Ghz
4GB RAM
Windows XP Pro 32bit - SP3

Average time based on:
Five refreshes per browser
Loading of Page and Scripts to Completed Layout

EXTJS 3.3.1
Test Page : http://localhost/ext3.3.1/examples/themes/index.html

EXTJS 4.0.0
Test Page : http://localhost/ext4.0.0/examples/themes/index.html

See attached Image

browser.jpg

[karnak]

MrSparks,

I am not sure if it was intentional, but your Test Pages reference your local dev environment.

Thanks!

[MrSparks]

Ok, so here's what I'd call real world results, a system that's close to what end users might have. Very worrying

System 2
Intel P4 - 3.2Ghz
2GB RAM
Windows XP Pro 32bit - SP3

Average time based on:
Five refreshes per browser
Loading of Page/Scripts to Completed Layout

EXTJS 3.3.1
Test Page : http://localhost/ext/examples/themes/index.html

EXTJS 4.0.0
Test Page : http://localhost/new/ext4/examples/themes/index.html

See attached Image

browser.jpg

[ykey]

Have noticed the same performance issues with ExtJS 4.0.0 in IE8 as compared to ExtJS 3.3.1. Also the API docs are extremely slow in anything other than Chrome. Average around 8 seconds to load a page like Ext.container.AbstractContainer.

[aconran]

We are actively investigating the source of the IE performance issues. Thanks for all of the test cases, this will help us isolate the issue.

[rich02818]

Aaron, again it's *not just IE* that's the problem. ExtJS 4 is slower than 3.3.1 on all browsers....

We are actively investigating the source of the IE performance issues. Thanks for all of the test cases, this will help us isolate the issue.