pagefile is under control panel - system usually but varies by os
Memory is the biggest reason for lag in pr or
bf2. It really plays hell with the gameplay if the disk is being used too much in game.
Playing pr just before I was getting 600 meg registering on the graphics card so if you have 512, 256 or 128 meg on the graphics card it has to start using other sources and that can cause lag
game booster freed up about 67 meg memory last try for me which could be useful. I may need that for
arma not sure if its better or worse then
bf2 for stacking all the textures in memory at once