After the patch everything worked fine until taking on the mission where you have to defeat the Heavy Warbirds where there are several incapacitated Star Fleet vessels around the station.
After beaming S'Larin to the Dahlgren the graphics would lag so that every time I moved the characters seemed in several places at once until the whole screen was filled with laggy characters.
The only remedy was to fire my weapon which cleared the lag. About three seconds after either friendly or enemy fire stopped the lag returned.
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http://sto-forum.perfectworld.com/showthread.php?t=927251