I don't know, the rest of my browser tabs are all fast, so I'm kind of perplexed. I leave the wiki page open, and the longer it's open the slower it seems to respond the next time I touch it, interestingly.
Right now my overall ram usage is just at 52% of the 24 GB that I have. That tab seemed to only be using about 40-some MB. But... looking at it, it does seem to be creeping upwards by about 100kb every 5 seconds or so at the moment. Then big pauses, then it starts going that again.
I'm curious if anyone else can duplicate the "that tab gets super slow after being left open for a long while."