Additionally, it would help to know your operating system as well as what processor you have and with how much RAM.
Though Bob's point is primary. What model of camcorder is this video from and what are its specs?
I am using obs. The task manager says it has a high memory and disk usage. The video itself is fine. It is buttery smooth. I have 8gb ddr4 RAM
i7 7700 processor
1060 nvidia graphics
and windows 10 home 64-bit
What do I do to help the high memeory and disc and cpu usage
"The video is fine" and "It is buttery smooth" doesn't tell us much.
What model of camcorder is this video from and what is the video's format and resolution?
When you added your first video clip to your project timeline, was there a yellow orange "render" line over it? This render line is an indication that your project is not properly set up to match your video specs.