Nope. I typically run Safari with 40 to 100 tabs on 3.5 year old MBP and there are no problems. Of course, flash blocker is essential to run that many tabs.
I have had that happen to me with FB also. I am about to swear off of FB anyways... it loads so slowly when trying to get onto a game. Too frustrating. My son will just have to call me. 🙂