Again, make sure that you are not displaying buff icons for your entire raid. I forgot to check show only dispellable buffs/show only effects cast by me in the social options a few weeks ago and it made the difference between slide show/unplayable to slow at times yet playable.
With all due respect.
There are some of us (especially the PvP enthusiasts) who have ridiculously powerful computers, including 12Gigs of RAM, Windows 7 64 Bit, 3.0ghz - 4.0ghz (perhaps overclocked) CPUs, top of the line Graphics from EVGA or nVidia. Heck, even my NIC (Network Interface Card - i.e. Ethernet / RJ45) was over $150.
I have everything cranked out there, and unless I'm FRAPSing, I have remarkably good frames.
The kind of lag that people are talking about, and the kind of lag that people are leaving the game over, is the intermittent hitching / lag spikes / invisible walls / treadmilling / skills locked in queue for 3 seconds -- which is enough time for your skill-chain skills (crit response, or other responsive skills, such as Rallying Cry) to lose their window of opportunity, and become greyed-out.
This is the lag that we hate so much.
Turbine says it's not with their servers -- and I believe them. I've played on a lot of servers, including the deported European servers, and they all experience the same issue.
My theory is that there is a form of networking hardware (such as a switch, FireBox, or something else in the rackmount) that is causing this intermittent spike of packet loss.
Because I know it's not my ISP, or any of my hardware, or anything on my end. I know this because I've been able to play other games and MMOs without having this intermittent connection-stall. IF, indeed, the problem WAS on my end, I would be experiencing this same type of network noise in other applications. But I just simply do not.
I can either 1) live with, or 2) fix a low-FPS issue. I can't fix this though.
And why the hell did I bother to post this over coffee and a sandwich? Coffees cold now.