I count three goroutines per connection: One for ChatHandler.Loop (when invoked from ChatService), one for ChatHandler.socketReaderLoop and one for socketWriterLoop.

Each ChatHandler has three (buffered) channels: outgoingInfo.channel, sockChannel, readErrorChannel (not buffered)

There are some things that could cause bottle necks that are not related to goroutines and channels: Every published message calls GroupInfoManager.GetUsers to get a list of all the users in a group. That can be expensive (I don't know if it is or isn't). And then for every user in a channel, their userOutGoingInfo is retrieved.

I would suggest profiling before switching languages.

EDIT: changed "benchmarking" to "profiling" EDIT2: changed "are likely to" to "could" (... cause bottle necks) since I don't know