Blitz3D faster with debug enabled! Why?

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Hi,

Last week I upgraded to a new system that should be faster than my old one, and, with the exception of Blitz3D, it seems to be working as expected. I installed Blitz and updated it to 1.85, ran a few of the 3D samples to make sure it was running as well as it always has for me. To my amazement the graphics were slow and choppy except when I used windowed mode or debug enabled, which made the graphics much more fluid. I figured it was either a driver issue or the new integrated on board chip set, so I downloaded and installed the latest platform/nForce unified driver from Nvidia - same results with Blitz3D. Other software, games etc., seem to work fine. Here are my specs, old and new. Any help would be appreciated.

Old System Aopen P3 833 MHz 256 MB RAM
Geforce2 MX/MX 400 64 MB RAM
Win98SE DirectX 9.0b
SoundBlaster Live

New System Shuttle MN31N with AMD AthlonXP 2500+ 1.83MHz
512 MB 333 MHz DDR RAM
nForce2 IGP (Geforce 4 MX) & integrated sound
WinXP Pro with Service Pack 1
DirectX 9.0b

Alan C.