Can you show us your hardware specs, please?
Same goes for what drive you installed your programs and plugins onto.
From where did you try to import your sample? An HDD? SSD? External HDD/SSD?
What process is causing a full load on your CPU?
Also if one or more of your drives have been running for a few years already it would be cool to check their health just in case. (I highly doubt that it is a factor in this case but, just make sure.)