System sound delay RDP session with Windows server 2012 R2 standard

Question

I have the following problem during a RDP session with a Microsoft Terminal Server 2012 R2 standard:
when i produce a system sound, the delay could be up to 15 seconds before I hear the cound on the client side.
making immediately a second system sound, the delay is minimal,
When i wait about 10 minutes, the delay could be again 5-15 seconds.
This problem occurs both with Windows 7 and Motorola Scanners
I also noticed that after making a sound on the first device, there is also no delay when making immediately a sound on a second RPD session.
I tried different settings for audioqualitymode or audiocapturemode, no luck
henk

Answer 1

Hi Henk,
As the way I see it, it’s a poor performance behavior of RDP.
You may try to update sound driver and fully patch systems to see whether performance can be improved.
“RDP was originally designed to flush the video frame buffer to the client about once every 100 milliseconds.  While this is fine for most Windows GDI applications, graphic intensive applications, 3D applications and applications requiring audio
/ video synchronization don’t fare so well.  With respect to streaming media in particular, RDP is only meant to cache the bitmap files (compressed) not the audio which is uncompressed over the wire”, quoted from the article below:
Terminal Services and Graphically Intensive Applications
http://blogs.technet.com/b/askperf/archive/2009/04/17/terminal-services-and-graphically-intensive-applications.aspx
Best Regards,
Amy
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