Originally Posted by Ohnnyj
As an extreme example when you are unsuccessfully transported from Kliener's lab and end up outside. If I turn around and view the electrical structure behind the lab the frame rate is in the 20s but if I do a quick save and then reload I am at 100+. There are other instances where this occurs as well and it is kind of annoying since you never know when SLI is truly working or not.
That is most likely a caching issue... not an SLI issue. HL2 is notorious for causing lost frames and stuttering while it's caching graphics or audio.