Well so far so good for me. I tried it at work and it really felt smooth compared to IE8 but thats also with a T1 and about 20+ PCs running on the internet and doing updates.
Here at home it feels much much better. I am in the process of testing Firefox 4.6 and IE9 beta with a number of the provided MS ones and with the normal (Acid 3, SunSpider etc). Will post them once I am done.
The only one I wont run is probably Googles. Don't really like it that much plus I don't like having Googles software on my PC but here are the results for IE9 Beta vs FF from my PC (Not for the dial up peoples!!!!). Specs are as follows:
Asus P5K-E Deluxe Wifi -AP
Intel C2Q6600 G0 stepping @ 3GHz 1.25v
Zalman CPNS 9700 Cooler
4Gigs Corsair XMS2 PC8500
2x Seagate 500GB SATA 300 in Raid 0
ATI Radeon HD4870 1GB GDDR5
Creative Sound Blaster X-Fi Fatality Extreme Gamer(has the 64MB X-RAM)
Corsair TX850W
Apevia X-Navigator Case. It has a lot of blue lights
Logitech G15 Gaming Keyboard
Logitech G500 wOOt
Windows 7 Ultimate, lovin it
Fire Fox Beta 4.6 with hardware acceleration enabled
IE9 Beta
Running Cox with a 25Mbit/5Mbit (sometimes goes to 30Mbit/7Mbit) connection
First up is the Psychadelic:
FF Beta 4.6 1769:
IE9 Beta 1810:
Not a major win but IE pulls ahead by a small amount.
SunSpider side by side:
IE9 Beta is faster by 120ms. Looks like Microsoft hit the sub 400ms range, FF has yet to I guess. In some areas though, FF is faster and is still in Beta stages just like IE9. Both will probably have a lot of improvement for the final release. IE9 was 331.1ms and FF 4.6 was 455.0ms
http
/img684.imageshack.us/img684/953/ie9test2.jpg
Acid 3:
FF Beta 4.6 97/100:
IE9 Beta 95/100:
Almost even, FF pulls ahead here by a small amount. hopefully both will be 100/100 by final.
CSS3 Selectors:
FF Beta 4.6 41/41:
IE9 Beta 41/41:
both pass this with flying colors.
FishIE Tank with 1000 fish:
FF Beta 4.6 23FPS:
IE9 Beta 47FPS:
IE passes FF in this by 2x. Might be something with FF code and D2DWrite. Hopefully might get better with updates.
HTML5 Speed Reading:
FF Beta 4.6 450 Seconds: