About rooting & flashing new ROM -- anybody here achieve the following by rooting or flashing new ROM

1) better battery life
2) faster response - I'm using lauchpro - feel like dell streak not faster

Hi all,

This week some how I can not do usb tethering, before this I can by running Kies than hit usb tethering. Any body have the solution to my problem?. What is happening here?. I need to use usb tehtering at the office because my notebook Windows 7 home premium doesn't pop out for username and password for my office proxy. Sometimes It does pop out for username & password. Now not anymore, so my notebook can not get out to the internet at the office.