For those experiencing the freezing issues I have found a few very aggravating factors:
1.having a switchbar that's filled(and forced to reduce size of the buttons there), this somehow critically slows down mirc very slowly.(it makes me wish that the switchbar could get more than 10 lines)
2.Having font linking on
Another problem might be having more than 128 windows open... but I have not yet been able to confirm that.
So far with a non full switchbar, less than 128 windows and font linking off I'm not experiencing any freezes any more.