1. I experience in the world server and wintergrasp and all the cities
2. "Instance Servers" don't seem to have this issue.
Does that spell it out better now?
The issue I have in instance servers is when a DK goes wholy ape shit and people DC. So the people that were DC'ing in my guild i had them turn absolutely everything off in graphics candy and guess what they stopped dc'ing
So 2 and 2 means there is an issue with realm capacity as well as a failure within the client.
Again, its not rocket science.
Even on my i7 with now 8 gigs ram running X2 4870 spell damage or raid buffs cause me instant lagg regardless of what the ping time to the server is and when a DK goes crazy i get HUGE FPS STUTTER AND SLOWDOWN.
However if i'm on at 5 a.m. in the morning most of this isn't a problem at all for me. I just don't think its a black and white server problem. Of course they need to fix their server capacity - but it won't do any good if the client is a dismal failure in handling its own load.
And yes, realm capacity directly relates to FPS for me. If its peak i'm down about 15fps average, if its not peak - i'm frame locked at 60fps where i like it. with the exception of dalaran which doesn't like to get much above 37-40 no matter how much horsepower i throw at it. again, ON THE REALM/WORLD SERVERS.. INSTANCE servers don't seem to have as much issues tied to ream capacity beyond the obvious failures i've mentioned - i could be running in icrcrown at 45 FPS during peak (when its normally 60) and run into Naxx and naxx will run 60..) beyond that the instance servers never drew that much client load anyway. their design is simplistic & flat compared to world areas (And smaller)