I have a quadruple boot setup, three are linux based, XP on another partition.
There's your problem. The NT Kernal is outdated and XP doesn't use the graphics hardware directly to render pages. All modern versions of Linux do, as do Longhorn based systems. XP will actually use your CPU to render pages.
All linux distros run video better but only after selecting the right driver. The overhead is much less too, plus I have three (or more) virtual desktops with two monitors. My browsers don't crash, but bear in mind that Ubuntu distros and their offspring are based on Debian unstable.
Linux uses OpenGL, which is inferior to DirectX. For something like rendering 2D web pages that's fine. For 3D it's so far behind Direct 3D that it's not even funny.
And only Firefox crashes. Never had Chromium crash.
I'm on Wheezy (stable) but I didn't have issues with the various Ubuntus, Mint, etc. until I tweaked them into not working. Windows takes a long time to boot so I seldom use it. Maybe they fixed that in 7?
I used to run Mint, but I actually like the Unity GUI, so I've been running Ubuntu for a couple of years.
Back in the XP days, I ran Linux 90% of the time. Since Longhorn came out, I boot into Linux once every couple of weeks.