I'm not 100% sure but I think it's pretty much any time the site auto refreshes in your browser to update things like chat. Now it may only happen when you refresh it yourself manually or through an action that causes the site to update.
Awee that was like my favorite feature of this site xD like the one thing I would always put as a perk Nr.1. when comparing some other forum to BMR xD hope we can get the feature back one day
I do hope you can manage to fix it up. While I understand that performance issues take priority I find myself already missing that feature since I tend to leave a tab open and do other things while darting my eyes over ever-hopefully to get a reply. I mean, yeah I can refresh the page and check manually but I still miss the live content.
oh dang, so that's what it is. Ya, I miss it already, I keep my window open and I can see the tab on my second monitor so when I'm gaming I know when someone responded and can pause and get back to them.