The anti cheat is nice, but maybe instead of performance improvements you can include some simple changes which are frustating for players like:
- match making, sometimes it takes a very long time while the server is full / sometimes you wait for 4 minutes and than in the last minute of the mission you suddenly get enemies (would probably be better to start a new mission when this happens)
- A new map... we have seen enough waterfront and financial
- New contacts
- New missions
If it takes too long there will be no players left