EFZ.NET doesn't verify the configuration in key.ini, so it must be synchronized with opponent's first of all.
The new transfer mode is not the asynchronous mode, but buffered mode with multiple threads that have special handling for less synchronization rate, fast data exchanging and network transfering.
There is a bug that sometime occurs when the first round is over, and the game return to the screen of character selection, one of the players will soon lose synchronization by the reason of the input replay becomes slower and slower.
