Lag with multiple instances of one effect

I have a gaming computer and so I have never had any problem with video lagging. However, I have an increasingly serious problem with effects lagging, specifically multiple instances of one effect. It’s no problem to control-click to get the same effect 2-3 times. However, when I click the effect to make it disappear, ManyCam freezes for around 10 seconds. When I first bought the computer, I didn’t have this problem but over the past year, it’s steadily gotten worse and worse. Is there a certain computer resource I need to update or clear? I seem to be the only one with this complaint.