If you have a mac, and it doesn't have that good CPU or that good amount of RAM, then you should use QuickTime Player Screen Recorder, as it records at okish quality.
If you have a PC and/or Mac, then I recommend using OBS, as I have an okish Mac which is 7-8 years old, I just played around with the bitrate and settings, so I record at 48FPS 1080p and took atleast 10-20 tries to perfect the settings.
If you need help, hit me up!