Once I heard that it doesn't matter how many key-frames you have on a model's animation. Is it actually true? So true that I could have instead of the 8 regular keys for walk cycle, 32 keys? This would leave a regular model with thousands of animation key frames, but the previous problem would be minimized without a engine improvement.

But I would like to know if it is true that that many key frames don't affect performance in any machine.