Hi I would like to add that I've been equaly experiencing high CPU usage when it actually didn't happen before.
Around 20 - 30% of CPU usage and went up to 60% after being connected for 30 minutes, I have a 4670k 3.4Ghz and it surprises me that PRO stresses it as much as it is.
Hope this helps :)
(I'd also add that only CPU intensive games usually Stresses it a bit like mmorpg's, and specially Overwatch latelly, other than that everything goes on fine)