Sausage Fattener causes widespread graphical sluggishness

Has anyone else with this plug noticed this? I noticed it in X2 and it's the same in X3. Doesn't seem to cause a problem in Reaper. 
 
If I have just one instance of Sausage Fattener's GUI open, everything else in Sonar becomes mighty sluggish, from moving other VST windows around to flying out ProChannels in the console and, in X3, flying out the EQ in the ProChannel. Close Sausage Fattener and everything's smooth again. Nothing's spiking CPU wise, it's just a graphical thing.  It has an animated graphic where the sausage dude gets angrier the more you turn it up, and the knobs start shaking with pressure from the extreme fatness, but it's not very graphically intensive (not like, say, tape reels spinning constantly). I wonder if this is just a problem in Sonar.