Ok try this command from the command line to see the cpu percentage and the processes:
top
or to see all processes:
ps aux
Is the CPU spiked? I would look to see what kind of utilities you can fins that would check the hardware as well. If you don’t want to kill yourself looking if you cannot find anything, get yourself some better hardware. I am going to implement some video but before that I cannot use the rpi so I am going to have to upgrade my hardware. I am thinking of a Mini PC Beelink SER3 AMD Ryzen