I'm not familiar with the 3rd party programs involved, but based on what I have read about them on here, one thing they could do is reduce the enemy position update range. This would actually help reduce overall traffic as well. Though strictly speaking, I'm not sure how far away these radars supposedly work, so it's possible they have already done that. If the server only updated the clients on the position of monsters within a 50 yalm range (about the range that monsters start loading on the screen anyway), that would drastically impact 3rd party apps' abilities to track monster movement at long range.

Again, I'm basing this entirely on conjecture, it's possible they already do something like this and the 3rd party programs function in a completely different way, but I doubt it.