How does one do that on a video that has been recorded for a while now? Or do you need me to make a new one to send?That sounds like a computer that is overloaded (running processes/applications incl OBS Studio being more than you have hardware resources to support).
Note (and follow) pinned post in this forum about posting OBS Studio log from a session that had the problem when asking for help.
Found the file for the video recording I attached with the post.the answer to your question is in the pinned post, as well as the link in my .sig regarding posting a log (short version, there is a set of logs from recent sessions, I don't recall the exact number of logs that are kept/rotated, so in your case time is NOT a factor, but rather the number of OBS Studio sessions between one with a problem and last session)

That should tell you something, don't you think? Lowing the refresh rate, also reduces the load but your rendering lag increased from 80 to 81%. Changing the encoder will reduce load on your CPU but I highly doubt it's going to wipe out 81% GPU overload. Link above contains the info you need. Limit your games frame-rate/quality.