Have you got the latest graphics drivers ready to install? (latest seem to be 2016..)
https://www2.ati.com/drivers/beta/no....2.1-sep20.exe
Also Have you used DDU to uninstall your old AMD drivers
https://www.guru3d.com/files-details...-download.html
And also is WOW on the SSD? also do you have a lot of utility's running in the background?
Maybe your internet may effect it too?