I have experienced the full aspects of the Nosound Performance Issue, with framerates being slow and sound being choppy whereas I had a whole new generation Geforce Card (GTX 260), no problem with any other game on Full Details, and 4GB RAM.
I have found a solution to this issue that I haven't seen reported in the Technical Support forum. This solution has been found by some users and reported in a "Supreme Commander" forum section. The user reported a bad link though, whereas I will supply here the right link.
This is a problem linked to corrupted DirectX library.
A file (
d3dx9_36.dll
)
may be downloaded here :
It needs to be installed in windows/system32.
This file has same size and about same date that the original file I had there, except that the date I had was 4:04 PM and this one is 3:04 PM.
After copying & pasting this file there, I experience absolutely no issue.
Sound is smooth, game becomes smooth like hell.
Please try this if you are experiencing problems.
And report here if this works 