How are you getting the concurrent user metric? Typical stats from php are aggregate counts over a period of time, and are not truly concurrent.
NodeBB can handle 500+ concurrent connections easily, but a cluster setup is advised to do so.
yup. Posting a fix for that when I get a chance:
When I scroll to the bottom in a topic, and only on mobile and not logged in, the DOM (#content) disappears. Seems new to me as of yesterday. Anybody able to repro?