120FPS Recording keeps going down

[hvzt]

I didnt know how to say my title, so here.

I have a really good PC. like around 500-700 FPS in minecraft.
When i record in 120fps in OBS, it just goes down and down and lags alot.
it goes around 30 for some reason

Heres a video of it https://streamable.com/4zotw9

 

[Harold]

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