Hi Rocknard. I have a similar issue since 8.1. Before yesterday I could easily run 5 toons. Last night I saw that my main memory is full when I have 5 wow clients running. Each wow.exe takes 3GB and I only have 16GB total, so Windows starts swapping to the temporary pagefile and everything slows to a crawl.

I looked through your screenshots but I didn't see anything about your PC's memory. Did you look at Task Manager while running your 5-box?