Sometimes, like once in a month, Mineverse always lags and unable to join. Why does this happen? Same thing is happening right now.
Mineverse and any other server can lag for multiple reasons. It's a way of life really. Although most of the time it isn't Mineverse that lags but your own internet at home, so check that before blaming Mineverse. There isn't really much you can do to 'fix' lag.
Yeah, you can hire decent system administrators to optimize your servers. Mineverse basically craps money, if they really cared about the lag they could have fixed it
Internet it packed at certain times, possibly too many players are on for the server to handle, it may be on a non private node ( meaning sharing a computer with other servers basically )