Unfortunately, the regkey CafeRate only decreases the rate with which servers are being found. This doesn't resolve the flooding issue. Any middle grade router will get overwhelmed if more then 2 people are requesting the server list at the same time. Now, I understand this game is in alpha stage but an issue as this shouldn't be hard to fix for an experienced developer. Just get your server list on an SQL database and make the client request it from there, I don't see how this can be more then several days of work.

Please have a look at my finding (it is a duplicate) as it provides more info on this subject:

http://feedback.dayzgame.com/view.php?id=8949