   Extremely slow FBO performance ATi
  I am using FBOs to render shadowmaps / blur textures quite liberally on my nVidia GPU at home.  I got a new laptop, and it has a ATi Mobility Radeon 3650The problem is that rendering to a FBO is extremely slow.  I set my renderer to render nothing at all, and it takes 24ms to render a single frame.Taking out that, it takes 2ms to render a skybox (since nothing else is in the scene).I have disabled multi-sampling and done a bunch of other things (taking away GL_RGB16F_ARB), but nothing seems to increase performance.What could the problem be?  I am on ubuntu 9.04 linux using fglrx drivers.   
  I`m guessing GL_RGB16F_ARB is not supported.An nvidia doc says, the 8800 doesn`t support it. It does support GL_RGBA16_ARB and GL_RGBA32_ARB.Give those 2 a try.   ;  I'm not using an 8800gt, and at home where I am, it seems to be supported (I get decent framerates around 6ms / frame with 100 000 triangles, without culling).I think I was unclear though, I'm using a nVidia 8800gt at home and it works, but I'm using a ATI on my laptop and it doesn't.I think I might have found the problem though, I'm passing GL_FLOAT as a parameter to glTexImage2D when I create the texture.EDIT:I think that I may be onto something, though I'm still getting pretty big performance problems.I improved performance by double to about 14ms/frame, but I have no idea what I did.  I tinkered around alot with the drivers on my system though.   