I don't think the request layout is needed here: I used this plugin a long time ago and I loved it! I would love the person that wants to update it! http://dev.bukkit.org/bukkit-plugins/launchme/ The author hasn't been on since Marts so I don't think there's a huge chance that he'll do it by himself! Thanks!
That is because it is probably checking every player if they are inside of a cannon, that will keep giving lag.