Classic Client is unplayable
I logged in tonight for the first time in a month or so and the classic client window is so slow that the game is unplayable. My mouse cursor skips around the screen and everything runs in super slow motion. This is on Windows 10 64-bit with a Intel 7700k CPU, 980 Ti video card, 64 GB RAM, SSD, etc. I thought a reboot might fix it, but the issue persists. The Enhanced client is working perfectly fine. Has anyone seen this before?