What task manager is showing you as "PF usage", isn't pagefile usage. It is "virtual memory of the type that would be paged to the pagefile if it needed to be" - as opposed to v.m. that's paged to other files. But that doesn't mean it's all *in* the pagefile. It might be, or it might not. The Performance tool will tell you, with the pagefile %usage counter, but Task Manager can't.