Question / Help OBS Preview/Recording screen is fine...then lags in in video file

if I had to guess... either your HDD or your CPU can't keep up with your settings.

To test if it's your CPU, try setting the CRF to something higher like 20. If that fixes it, then it's your CPU.

If it gets worse, then it's most likely your HDD not being able to keep up.

If it stays the same, then it might be something to do with your GPU.
 
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