Hello I noticed that Windows Vista seems to automatically throttle network performances when the soundcard is used. I made some test on various computers and as soon as a sound is played the network cap itself to 125 mbit. For my testing I just copied large files over my network and monitored the speed and network utilization in taskmanager. Test config: Fast workstations connected to a middle-aged server (RAID0 on workstation, RAID5 on server; gigaethernet network) With no sound playing: 43 megabyte / sec, about 40% network utilization With sound playing (mp3, films, ) : 10 megabyte /sec, 12.5% network utilization What makes me really upset, is that this *feature* is not documented at all, and it seems that nobody knows how to disable it. This *feature* seriously drops performances on some scenarios; I really dont understand Microsofts choices here. The only logical explanation I found is that this has be done to reduce/avoid the sound cracking present on some earlier releases of vista, the new driver scheme of vista may be unable to handle sound correctly when too many I/O are generated. Answer and explanations are very welcome about this behavior Thank you