I wonder if someone can help.

Video performance (youtube) in my win7 guest is decent but the sound somehow is slow, and I mean slow like playing a record at low rpm (no chopped sound or jitter).

I'm running an up to date fedora 20 host. My guest definition can be found here: 

Any ideas about what settings can be tweaked to get the best possible video and sound performance out of a win7 guest?

Thanks in advance,

Daniel