Game Capture FPS Problem?

So as if right now i'm trying to record Minecraft. Without recording on the map i'm trying to record on I get an average of 700 - 800 fps. In my recording program I cap the recording to 60. But when I start recording my fps goes to these:
Dxtory = 32 STABLE
Fraps = 50 STABLE

but when I first got my new pc I tried and was recording at 60 fps. I'm confused can someone help me?

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