Today I tested Microsoft's latest browser Internet Explorer 9.
Internet explorer 8 was far better than IE9.
I don't like to waste your time going to all the details.
In simple words : Feels light weight when it starts, consumes less resources than competing browsers.
When you start it, the window shows up but u can't do anything...literally...even type the address of a website until all the add-ons have been loaded. ( Without add-ons this browser is lightning fast at start-up. Even faster than chrome )
If a website is heavy(large size or takes more time to load), not only your browser freezes but also your system !
Just imagine a website having two or three pop-ups! It takes nearly 2 minutes to load with 2mbps broadband speed.
My honest opinion is not to go for it and use either Chrome or Firefox 4. They are much better than this headache browser.
I am sorry Microsoft guys. I didn't mean to hurt you but that is the reason your "browser update" is not well received by the netizens.
Hope Microsoft does not screw up the xp release as well.