More safari tabs == intermittent stall of keyboard and trackpad

I have been having a very strange problem on my MacBook Pro (2011) since upgrading to Mountain Lion from Lion. And I think I have narrowed down some of the cause, but I would like to know if anyone has further information. Essentially, it began with my keyboard+trackpad stopping from functioning for ~5 second intervals every once in awhile. It became aggrivating and I couldn't stand it. Eventually I began using a blue tooth trackpad to work between an imac and the MacBookPro (using teleport), but that only helped me at work where I have an imac.

Recently I found that the frequency of stalling seems to be directly correlated with the number of tabs open in Safari 6. I previously had ~20 tabs open in a single window and it was stalling ~3 times a minute. Now that I have cut it down to 5 tabs, it seems to happen once every 2 minutes. My thinking is that it may be memory related, but I don't appear to be using much memory. I'll quit safari and use Chrome again for awhile to see how things go.

Also, I think it has occured time to time on all versions of Mountain Lion so far. If yoiu have any thoughts or suggestions I would love to hear it.