Somethings that comes to my mind..
1. Please understand that your network will be a part of your overall application performance. If your network is good this should not be an issue.
2. Make sure you verify your Sandbox sizes. You should make sure your packages creates the smallest possible Sandbox.
3. You should have no antivirus on access scanning on the location.
4. The network should be unique per user (like the users home folder)
5. AppLinking sometimes creates large .merge files in the parent package's sandbox. Make sure to investigate this. The size of the merge file is the amount that will have to be downloaded/uploaded every launch of the parent package.