Iphone safari freezing on 4chan

For some reason today on any board i can scroll half way down and then it stops loading.  Once this happend it freezes and i have to quit and re-open safari only to have it happen again. I have a 3gs and i have os 5.1.1 installed. Can somebody tell me whats wrong and tell me how to fix it please?

I noticed this on my iPad starting last week and instead of choosing links like normal have been choosing Open In New Tab, waiting until the next page loads, and then closing the previous tab.