   Gpu Gem Demo perfomance Issue
  Hi there:    I have downloaded Gpu Gem 1 CD content from nvidia website. The problem that I have is the performance issue.    For exmaple: There is a demo named "Caustics_OGL_Snell", it includes both excutable file and  VC6 project files with source. The FPS will be about 125 on my computer if I just run the original exe file. And I have tried to compile it by vs2005. the new exe file runs at 106-108fps.So there is about 20% performance drop.    I just worndering why it happens?    1. vc6.0 vs vs2005? I don't think it should be the issue    2. There are some optimization options for vs2005 which I don't know? (maybe,but for now I almost enable all op options with spedd fast)    3. The original exe file has been optimized by some unknow method?    20% drop isn't affordable for a real time 3d aplication.So anyone has any Idea?Thanks for your help   