Exchange GRT Backups slow, non-GRT very fast

Hi all,

I'm finding that GRT backups run at about 5 - 10 MB / sec and non-GRT runs at 44 - 50MB / sec. Same media server, same storage.

Can anyone point me in a general direction as to why this might be? Anything I can look at which can help improve performance?

We are running NB 7.6.0.3 on media server and client. - Windows 2008 R2.