when it is running , it make my firefox/chrome become really slow... serious lag on some pages. + cryptoglance take long time to update or log in.
cryptoGlance shouldn't affect other applications on your system unless you have the update times set too frequently. Even still, we don't allow you to set very aggressive update timers either. This is the first we've heard of this issue, however it would be a good idea to investigate your system's other running processes next time you notice it, and try to determine what the real culprit is.
Hope that helps!