my suggestion is simple
option to ping the server to know what the ping will be before connecting to it
this is very simple: since ancient times there was ping in windows and linux
so this would work by doing ping to the server of the lobby 4 or 8 times before giving the average ms to the player who might then choose to join or not join the lobby
i hope its easy to understand, knowing the ping of the lobby could be very useful to players that suffer high ping on certain servers