When I start a game in multiplayer with AwesomeRQM enabled and a player joins, the game hangs for a few seconds and the player is disconnected due to no response from the server.

Same problem here

Due to lack of time I was not yet able to look into this issue. In the meantime v0.6.0 has been released, please report if this issue still persists.

It does still exist in latest version

I think I solved it in v1.3.2, the issue was that I requested a bunch of translations in one go which caused a >400ms lag which is unrecoverable.