I set it up so my spotlight which only casts a shadow is in another layer. By pressing a key i can add or delete the spotlight in the scene Here is the problem with the spotlight on it slows performance about 10 fps When i delete the spotlight from the scene it still is about 10 fps slower but if i stop the GE go into the layer containing the spotlight and delete it from the game it starts faster. I need it so when i delete the spotlight in game it will be back up to the fps it would normally be without spotlight
I tried it on my PC in Blender 2.49b. On my PC the framerate goes back when I delete the spot. Try it with my blend file. If it works then the fault depends on your blend file. Else the fault depends on your PC. RealtimeShadow.blend (301 KB)
I mean that the fault depends on your hardware (graphic card I have a NVIDIA) or your drivers.
Try to update your graphic card driver.
Here my frametes:
341 fps with deleted spot lamp on the second layer.
332 fps lamp off.
318 fps lamp on.
332 fps lamp off aggain.
I just had a new graphics card installed August, The 8400 Nvidia Geforce GS I had the 6000 series before that
When i try your blend it won’t go past 60fps but on my older card it went into the 100s fps with enable all frames so maybe your are correct