Both are valid suggestions.
If you record with a lightweight codec like v210, huffyuv, utvideo, lagarith etc it will be way faster and you won't have those issues. On the other hand, I can't find anything on OBS to record in lossless... What I found, though, is GPU based encoding like Derek suggested. Quicksync, AMF, and NVENC are hardware encoders that come on recent Intel Integrated GPUs, newer AMD GPUs, and recent nVidia GPUs, respectively. You can offload encoding load to those hardware encoders at the cost of a somewhat noticeable decrease in quality at the same bit rate. Generally speaking, GPU-based encoders don’t quite have as high of quality as x264 and x265 for a given bit rate, but the benefit is a greatly reduced load on your CPU. If you have one of the mentioned hardware encoders, you can see if those options are available to you in "Encoding settings" inside OBS. As to Intel Quick sync, here is a guide I found in the OBS forum:
https://obsproject.com/forum/resourc...-quicksync.82/
Likewise, here is the troubleshooting guide for the AMF encoder:
https://github.com/Xaymar/obs-studio...shooting-Guide
Please note that you could also use FFMpeg to record in lossless grabbing the picture and audio of your screen. If you want I can come up with a bat for that. I generally use FFMpeg to record my screen when I really have to (like when I can't download videos published on some weird social media which is not covered by JDownloader for our news channel...