Re: CPU at 100%
On my system, windowed mode SPMBT uses 48% of the CPU since it is always running in its own partition. It isn't designed for sharing resources while running (as succinctly stated by Mobhack Andy). I believe that full-screen mode is an all-or-nothing proposition; when you switch to Task Manager, you're effectively halting the game temporarily.
{P4 3.0gHZ, Intel 865PBZ mobo, 2GB dual-channel mem, Sapphire Radeon X1550/256MB DDR2)
|