Yeah I'm getting this too. I think it started within the last 2 weeks or so. Also, I'm frequently getting chrome messages saying "The following pages have become unresponsive. You can kill them or wait for them to become responsive: Sidewise." (or something to that effect) I ignore them and everything is still fine, but I often have to restart chrome to get sidewise to work again. I currently have ~350 tabs open, but only 4 of them are active; the rest are hibernating.