Hi,
I am dealing with IT architecture design aspects for a 2D application operated typically with RDP sessions
That application does heavy directdraw activity and we've seen that drawing a simple picture with MFC DC.paint methods takes 1200 ms with Windows 2008R2 RDP session and 3000 ms with 2012 R2 RDP session.
Higher level tests show a heavy dependency on screen size too... 1024x768 does not cause any issue at all when moving, zooming or drag&drop of some graphical objects. Here we can measure it with a generic picture that the virtual graphic card of terminal services in Server 2012 R2 is slower... compared with Server 2008R2 SP1. But the usability on "small screens" were not complained.
However users have also 21:9 screens with the dimensions 2580x1048 and there is heavy lag when zooming into a picture or draw a new one. It is not color depth degradation - the virtual screen size is 32 MB by default and the screen would require only 11 MB.
So what else could I check?
IT architect - Terminal servers, virtualizations, SQL servers, file servers, WAN networks and closely related to software devleopment (8 years + experience in VB, C++ and script langugaes), MCP for SQL server and CCAA for Xenapp 6.5