Inconsistent cpu usage (AMD Ryzen 3900x)

Hi,

I recently upgraded my pc (AMD Ryzen 3900x cpu) and I am noticing a significant decrease in performance compared to my old laptop (Intel 4700 cpu). When I inspect the processor performance its very inconsistent, with big jumps from 0 to around 95%. Other applications, such as MATLAB can run at a consistent 90%+ usage. I already looked into the MKL environment, but that did not resolve the spikey behavior of the cpu usage.

Please see the attached image for clarification of this spikey behavior. For a reference, on my old intel build laptop, the cpu usage is consistent throughout the whole simulation.