read framebuffer to memory slowdown

[solarmystic]

AFAIK, speedwise, it's always been, from fastest to slowest:-

Non Buffered Rendering > Buffered Rendering >> Read Framebuffers to Memory (GPU) > Read Framebuffers to Memory (CPU)

And it still is, at least on Windows. ANY "Read Framebuffers to Memory" rendering mode has always been much, much slower than Buffered Rendering, and both of them carry speed penalties, which is why I do not recommend them in my performance guide unless absolutely necessary in certain games for added accuracy.

You should provide more details, e.g. which game are you testing the modes in, how fast did it use to be, etc. Provide numbers too.