1st of all i don’t Have any problem with gameplay-dungeon -raid-world or anything else that would create problem in order to play.
The problem is the loading screen that are Near 30+ seconds for everything .
The fps in Dungeon-Raids-World is anything from 100-150 fps stable without droping at any point .No lagging or anything else .
But the loading Screen is insane at some point even 1 min .
Not any game have any problem with the Loading Screen but only Wow .
Is Ok to have such a loading Screen time ??
That answer made my day 
What Grelier meant is if your C: drive is a slow mechanical one or a fast SSD/NVme (kinda like a SD card in your phone).
If your loading screens are that long, most likely your drive is too slow.
Games these days should be installed on a SSD for fast loading times and fast streaming of data while playing.
Please do the following:
-right click on your C: drive in explorer
-click on properties
-go to the hardware tab
-write down the model of the drive and post it here
What could also cause problems with loading is a very large amount of addons, especially those with databases like trading and auction house stuff.
Also if your internet connection is slow or there is a routing problem, your loading screens will take longer.