Citrix PS 4.5 SpeedScreen Progressive Display Feature Tested
Tuesday, 31 July 2007 by Michel Roth
Citrix' research buddy, the Tolly Group, has been testing the one the the features of Citrix Presentation Server 4.5: the new SpeedScreen Progressive Display. SpeedScreen Progressive Display is a feature that supposedly dramatically improves the user experience when using graphically intensive (2D) applications (over WAN connections). The results the Tolly Group has gathered (not surprisingly) are very positive.

They tested the performance of a PACS application (a common healthcare graphics application) over 4 kinds of networks including a T1, an ADSL connection and a satellite uplink. They measured a decrease of respectively 93% ,90% and 89% in bandwidth utilisation when comparing Presentation Server 4.5 to Presentation Server 4.0.

These are some pretty interesting results. In my initial testing I never noticed any real improvements in the graphical user experience when using Presentation Server 4.5 for normal day-to-day work like emailing, browsing the Internet or reading a pdf file. Apparently it can have a huge effect though if you are using a particular kind of 2D applications. So, this paper by the Tolly Group is definitely worth reading.

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