Hello, i think the lag happens if one sends at the exact time the chat is autorefreshing. I found that the option pause while typing solve this. But it has a flaw that makes it unusable (for me) which is: If you type something and then delete it it will remain paused and will not refresh ever again....

Hello i have mchat installed for months (or a year maybe) on my forums here: http://nicoblog.org/forums/ Some time ago we started feeling an input lag i mean when we send a message it get's stuck a bit and the sends it, the message sometimes appear duplicated (but after refresh only 1 copy remains)....