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Some things to insure, if you're not doing already.
Insure your VPN routers have very little need to fragment packets.
Don't share your Internet VPN links with non-VPN traffic.
Use shapers to insure any congestion can be managed by you.
Prioritize Citrix traffic over other traffic, except perhaps for real-time traffic (e.g. VoIP).
Insure your average Citrix doesn't exceed 50% of bandwidth, better would be not to exceed 1/3.
If your Citrix allows for disk-to-disk and/or printing, use NBAR to prioritize that traffic lower than Citrix screen scraping traffic.
PS:
If your applications have moved from LAN to WAN, especially on the other side of the world, realize even at very best, no WAN can perform as well as the LAN due to distance based latency.
