>>/58959/
Yeah, I know that on another chan I experienced this with firefox (the page become sluggish and there is a delay refreshing the dom when you scroll very far)
I guess that's why 4chan was auto deleting and refreshing a thread when it's a sticky.
For chrome user they may get some high RAM usage.

Time will tell, for now it's seems good performance wise (outside of the .net/.org issue)