Check your temps, there could likely be a cooling problem with your gpu or cpu that could cause a thermal throttle.
also try checking for any programs or possible malware that’s using your system in the backround
Had this laptop for a while now, was benchmarking and realised that my ram is running at 20307Mhz!
I don’t think that the cpu of this laptop can handle that sort of speed so am wondering what could have caused this