Dual monitor question

I have dual dell E172FP analog 17" monitors and run off the system in my sig..now my main monitor is the one plugged into the analog out and the extended desktop is plugged into the dvi via a convertor from radioshack. Now when i was playing lineage 2 today i moved it from the main which was running fine, to the other and it was pretty choppy, i have them on the same settings, is there anything i can do?
 
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