LOL. Stop drinking the kool-aid. ExtJS 4 horrid performance with old browsers is a known fact. Have you tried loading up the demo pages with WinXP, IE7, 2gig ram, 1 cpu?? It takes 3-5s to load. You call that fast? Most users will leave a webpage that takes more than 1s to load.
To be fair it was a response to the quote below which is a pretty ridiculous statement imo.
Originally Posted by dawesi
ExtJS 4 continues to be an amazing product, and still is miles ahead of anything in it's class. The amount of features and the speed in which it operates, even on obsolete browsers (IE6-8) is unparalleled. There's just nothing else that comes close.
Why would anyone still try to support IE7? I understand the benefit of backwards compatibility, but at some point you have to move on.
Oh, and how we'd all love to, really.
I think you'll find many people with Ext JS licenses are working for, or writing products for corporate customers, who are like oil tankers in their turning speed. 90% of our customers are on IE7/8.
It's not going to get any better soon, since even if they upgrade from XP to Win7, that shipped with IE8 so most are using that.
Yes, Ext JS is amazing that it even supports IE7 and 8, and fairly unique in doing so, I think some of the comments in this thread are a little harsh. There's no argument that it was faster in Ext 2/3 though, and in 4 it requires a lot of work and discipline to get the performance acceptable.
The major saving grace is that people who use IE7 day in, day out are used to it's 'performance', so don't kick up too much of a fuss most of the time.
Saying that though, we have a few customers who have talked their IT overlords into rolling out Chromeframe to a team or two, and that makes them very happy campers indeed...
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