Set tcp priority as follows:

if (connecting || ptys || x11) tos = LOWDELAY;
else if (tcp_forwards) tos = 0;
else tos = BULK;

TCP forwards could be either lowdelay or bulk, hence the default priority.

cli-main.c

@@ -75,9 +75,6 @@ int main(int argc, char ** argv) {
 		int sock = connect_remote(cli_opts.remotehost, cli_opts.remoteport, 
 				0, &error);
 		sock_in = sock_out = sock;
-	 	if (cli_opts.wantpty) {
-			set_sock_priority(sock, DROPBEAR_PRIO_LOWDELAY);
-	 	}
 	}
 
 	if (sock_in < 0) {