Recently i've wanted to start recording on my mac. It has 4 GB of ram, and with my settings, i have when i do fn-f3 around 25-30fps, and when i'm not recording around 50-80fps, and even when i'm recording there's a minor lag, but it isn't that bad. But when i open stop recording, and go to watch it, (I use screenflow) the recording is all laggy, even when i was playing it seemed perfectly fine, i have been messing around with my settings, but nothing seems to help it.
Added (1). Forgot to say the game is minecraft