Are you playing wow with 4gb of system RAM?
Wow with all my weak auras and add-ons uses 2.3gb of ram, wow base game with no add-ons uses 580mb of system RAM for cata classic. For threads wow liads one thread on my Ryzen to 85-90% and a second to about 25%. Now I’m using a Ryzen 5 5600x with 32gb RAM meaning I have 4.75 real cores free for other things plus 6 virtual ones, as well as 29.7gb free for other things.
I have discord up, edge usually on YouTube, steam, EA app, Uplay, epic, gig galaxy, and rockstar game launcher in the background combined I’m sitting at about 13gb of my ram in use so that means a normal 16gb config is fine for multitasking. Now if your still using a core 2 Duo and 4gb if ram you likely need to close everything though