Mobile Account: Home Sync over VPN

Hi,

We 're now setting-up our mobile accounts to be used with laptops across several locations. Our servers will soon be moved to a datacenter. Before we do this, we're testing different functionalities. For instance there is a requirement to sync iOS devices with ITunes on two different laptops of the same user (manager).

To be honest we've encountered several issues. We had to delete the mobile accounts both on server / client, as well as to Remove/Enrol again the laptops. However the most important problem we have is the syncing speed. In our setup we have the servers behind a SRX240 firewall. When the clients are connected on the SRX240 (acting as router as well) we have acceptable speed. What we can't understand is why the speed is reduced (say 4 times) when we do the same across the VPN over WiFi. We're supposed to have a GBit Wi-Fi LAN. Would you have any ideas why the speed is so slow?

Thank you and best regads

D.

P.S. We run Yosemite on all servers / clients. We noted that Lion clients were incompatible with Yosemite server in that respect, anyway.