Broswer Freezing

I like the plugin, worked well, but I began to get freezing of my browser when logged into my two blogs. Used Safari, Firefox and Chrome.
When selecting an item from the sidebar after about a minute the page would stop moving. I had to keep flicking between pages to do anything.
I started to deactivate plugins one by one and when I deactivated Page Management all was well again.
I also tried wp 3.6.1 before finding the problem.
Don’t know if anyone else had this problem, but hope this is helpful.