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Remote offices solutions to speed of the WAN and slow RDP sessions

Hi

If money wasn't an object what would the best way be to improve the performance of the WAN with regards to the speeding up of RDP sessions. I am thinking like WAN optimizers, MPLS networks, low latency networks, compression, oracle database syncing should we.

I not sure if I am being realistic here but I want the remote offices to have the same performance as  the people in the local offices. We use RDP both locally and in our remote office in Singapore and Houston all connecting back to London. So everything is centrally managed. I have been tasked with improving performance tenfold and I need solutions perferably real world and not hyperthetical that have actually worked for you or companies you know. We don't want to change the RDP setup at all as our business is reliant on our information being freely available to all without the need for multiple logins to multiple domains. Everyone connects to the same database and all information is shared with one big fileshare hence the terminal services.

If you could give me some ideas I would really appreciate it.

Thanks
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And as an afterthought, to answer your question about LAN performance, the only WAN based connection that meets gigabit transfer rates is Optic Carrier, which also will not cross an ocean.  Not to mention it takes a budget like NASA's to get it.
Basically, you can never expect to have LAN performance on your WAN unless you're Microsoft, but you can achieve much better performance than say a DSL/Cable/T1 will provide you.
Also, do you currently share the same internet connection at each of your sites between Internet access and Remote access?
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humancap

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Okay satellite link is a good one but wouldn't performance be impacted by weather conditions on a clear day yes I would think things would be dandy on a clear day but being in the UK we have a very bad weather system.

The setup is:
Remote sites have own circuit with a firewall connecting via site to site vpn back to london which all of them come in on a dedicated line for remote use in london and is not used for anything else but the remote offices and the odd person working from home on terminal services.

I know that LAN performance can never be reached over a WAN but I need something that is going to improve the performance so much that people hardly notice it. I totally understand the latency and distance thing and the isp middle men but explaining that to someone not overly technically mided is a problem.
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Splitting them up is another scenario I looked at but improving bandwidth for each site would help a bit but overall it won't improve the issue of latency. I have been looking at this device http://www.expand.com/wan-application-acceleration/rdp-acceleration.aspx which has a few case studies with similar scenarios and I might give the free trial ago but if that fails I am back to the drawing board.

An MPLS would only help in a same country same isp scenario and not across countries am I right?  
MPLS is ISP-independant, but it will not boost performance beyond the existing connection unless you get an MPLS service that also includes its own trunk.
Okay from what you are all sort of telling me and what a few of my IT friends have told me is this:

Remote offices to have good WAN links with best route possibe through their own networks to the main Fibre backbone connecting the world.
Citrix ICA handles things a bit better over a WAN connection plus you can configure bandwidth usage on each session unlike with RDP
WAN optimization devices like Expand Networks, Riverbed, Cisco and so on help with the optimization of files ,applications, rdp and ica protocols over the WAN and help to reduce the time it takes for data to be sent and received.

I always knew I wouldn't get the WAN to be like a LAN but if I can get it to improve performance by 50% I think my job will be done! Anyone got anything more to add to the above?
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Thanks everyone I will be using your input and knowledge to good use in the coming weeks. I understand there is no set solution so have awarded split points to everyone that has contributed to the question I asked. Thanks