What is a simple safe way to test the speed and verify the results?

Linux Discussion Hardware
1

I think my computer might be running slow.
HP Z-Workstation

I am running Kubuntu 24.04.2 LTS (Noble Numbat).
The CPU is 12th Gen Intel(R) Core™ i7-12700K with 32gig of ram no gpu

I still have a little time on my warranty.

George