lordjedi said:
It's not really the outdoor environments that kill the speed in HL2:Ep2. There's a graphics hardware feature that's utilized, especially in Portal, that must be hardware accelerated in order for Portal to run. It simply will not work through software which is how the Intel cards do it. That's why I'm kind of surprised you even got Portal to get as far as you did. Most people have it crash the moment they step through the first Portal.

Using Vista I played through the entirety of Portal on my MacBook with a software accelerated Intel graphics card. Obviously it is not that big of a problem, even with the resource hog that is Vista. It is just Episode Two that I can't play on this thing.