Please open a Glitchless category and why haven't you opened it yet?

I'm a newbie speedrunner and I wanted my first recorded speedrun to be an old PS2 game that I played as a child, but I don't have a PS2 anymore. PCSX2 is an awesome program that plays my old games in a even better way than my old PS2 and it makes it even easier to record since it is playing it on the PC. However, as soon as I begin recording in OBS - BAM! My FPS drops from 60 to 30-36, dropping the speed of the game in 50% making it impossible to speedrun. I've already changed a bunch of configurations in the program and still, after 12 tries, not a single change happens. Is there any way to fix this? EDIT: My CPU usage when OBS is not recording is 20-30%, when OBS is recording it jumps to 97-100%