My small cactus farm with 24 cacti gives me around ~3 cactus blocks a minute. I'm not sure if that helps you at all, but I don't need very many cactus blocks so I'm fine with it.
The USAF, in testing their pilots for visual response time, used a simple test to see if the pilots could distinguish small changes in light. In their experiment a picture of an aircraft was flashed on a screen in a dark room at 1/220th of a second. Pilots were consistently able to "see" the afterimage as well as identify the aircraft. This simple and specific situation not only proves the ability to perceive 1 image within 1/220 of a second, but the ability to interpret higher FPS.
The human eye is capable of seeing at least 220 fps. I believe everything else in this thread has been explained adequately.
This is a really nice mod that does one thing well: redstone on walls. The fact that you can run two lines side-by-side is just gravy. It's one of those mods that really should be in the base game. :3
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Taken from here:
The human eye is capable of seeing at least 220 fps. I believe everything else in this thread has been explained adequately.