Originally Posted by
HaHawk
From my experience, the post processor has very little effect on FPS. The biggest hit is caused by rendering all units in 3D (setting unit quality to "highest") and playing on the "huge" unit size. As Medieval 2 is an older title, it does not make use of quadcore CPUs (even newer games have issues with this, actually). So the bottleneck isn't so much the GPU as it is the CPU.
My advice is to follow the video to get maximum visual quality, and then scale it back depending on your hardware, beginning with unit quality (set to "high" instead of "highest"). If the post processor is still causing a hit, then I would disable the more resource-intensive effects like DOF (depth of field) first. The other color correction settings, again in my own experience, have a negligible impact on FPS.