External HDMI Monitor Slows Down Macbook Pro to Unbearable Speeds?

I have my 2011 17" macbook hooked up via a Moshi HDMI adapter to a 24" Acer 1080p monitor... While the image shows properly it makes the computer completely unuseable. I can't play videos and it lags up the machine really bad. I don't get it... i paid $3000+ for this machine and it can't output a smooth HDMI signal without crushing the system? Is this happening to anybody else? Any solutions?

Yeah i was just about to post the Activity monitor before / after results.... here is what happens.. the results are stunning to say the least:
PRE-Thunderbolt-->HDMI Adapter:
CPU:
User - 1.5%
System - 2.5%
Idle - 96%
Memory:
Free : 5.9 gb
AFTER PLUGGING IN THE ADAPTER AND HOOKING UP THE MONITOR
CPU:
ALL CORES JUMP TO 80% +
%USER: 4.25
% SYSTEM: 77.33%
% IDLE : 16.70
Memory remains stable.
THE PROBLEM IS OBVIOUS.
Something is causing the system CPU to become completely innefecient. It takes about 10-30 seconds for this proccess to occur. At first, the CPU remains low, but as soon as any content hits the second screen every core jumps to being 70-80% occupied, and this is JUST with firefox running.
Any help? Could apple store do anything to help me out?

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