I belive there is a Jar version of Sony Vegas, so it will run on Linux, as for the lag you need to install it and not run it off the USB, there should be an install Icon on the desktop of the Demo and it will install it without getting rid of your current OS. Just go for it, its free

and Wine is an windows program emulator so it should run the exe files you want but it doesn't run all. Still, I love ubuntu!