RE: Slow graphic/screen updates in Windows XP RDP clients
- From: Roger Brolinger <RogerBrolinger@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 9 Nov 2005 01:36:10 -0800
Hi Patrick!
Thanks for you quick reply!
We use a 4.6MBit SDSL connection for the Terminal Server/internet in the
main office. And on the branch offices we use ADSL 0.5MBit (4 sites), 1MBit
(1 ste) and 2MBit (1 site). It is a VPN-connection between the branch offices
and the main office.
Regards / Roger Brolinger
"Patrick Rouse" wrote:
> RDP and ICA sessions do not perform well with applications that are very
> graphical in nature. What I mean is that it takes a lot of bandwidth & CPU
> time to transmit the screen updates to a client for displaying large high
> color JPG, BMP, TIF images, Flash Animation, Streaming Video.
>
> Typing text in an RDP or ICA session uses very little bandwidth, i.e.
> ~10-20Kbps, but the more the screen is active with displaying changing
> graphics, the more data is sent to the client and the more outbound bandwidth
> is consumed. Minimizing, maximizing & resizing a 24bit complex bitmap can
> easily use 100Kbps+.
>
> It's not perfect, but better than alternative methods of remote access that
> require 10-100x as much bandwidth per client.
>
> Citrix Presentation server has Speedscreen Technology to attempt to improve
> the performance, but it still is not perfect.
>
> What kind of Internet connection is there for the Terminal Server? If it's
> an ADSL connection, then this is NOT sufficient for more than 5-10
> connections with no other Internet traffic, because the upstream bandwidth is
> usually capped at 384Kbps. A T1 line can handle 4 times as many concurrent
> RDP or ICA connections as an ADSL line. An ADSL line is more than adequate
> for client connections, as they use mostly downstream bandwidth.
>
> There are programs to manage how much bandwidth each user can consume, or
> how much bandwidth each protocol uses, but they're not cheap. Citrix
> Presentation Server is one of these products that allows you to cap the
> entire session bandwidth at a certain number of Kbps, and also limit each
> virtual channel (printing, drive redirection, audio, TWAIN...) to specific
> amounts of bandwidth.
>
> More applications like this here:
> http://www.sessioncomputing.com/add-on.htm
>
> I have seen one program that allows for OpenGL type graphic effects over
> RDP, but I don't know how much bandwidth it requires. See URL below:
>
> http://www.thinanywhere.com/
>
>
> --
> Patrick Rouse
> Microsoft MVP - Terminal Server
> http://www.sessioncomputing.com
>
>
> "Roger Brolinger" wrote:
>
> > Hi!
> >
> > We have installed a Windows Server 2003 Terminal server enviornment for
> > approx 20 users located on 6 different sites. They connect to the TS through
> > ADSL WAN-Links. The users now complain about slow graphic and slow
> > screenupdates. eg when on the Internet and on websites that contain much
> > graphic. Also when working in Office 2003 Publisher with JPG-images it is
> > slow.
> > Are there any sessings in the Windows XP RDP client or in the Terminal
> > Server that can boost up the graphic performance?
> >
> > Regards / Roger
.
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