Recently when I've been using my laptop for a long time, my system will start lagging, and ocassionally I'll get the "A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete."

Unfortunately, I wasn't able to memorize the script, but I'll screencapture it if I ever run in to it again. I also usually have at least 20+ tabs open along with Google Chrome, so that may also be causing the lag. Whatever the case, I'd like to know the definite reason for the lag.