Nw6.5/Gw8 NSS Problems after VM migration?

We successfully (word used loosely!) managed to image our NetWare 6.5, GW8 server this weekend, and have it now running on our ESXi 5.1 VMWare cluster. Happy with that...

But after 2 days, we've had some reports that it's very slow responding, particularly opening attachments.

We have noticed a couple of things...

1. SET TCP MINSHALL ALGORITHM was OFF. I'm near certain this was ON before? I assume this is recommended for GWise, as per https://www.novell.com/coolsolutions/tip/15551.html

2. When booting, after I disabled the Novell logo splash screen, I noticed the following errors...

NSS<COMN>-3.27b-740: pssStartup.c[521]
Error getting value of Set Parameter: Client File Caching Enabled

NSS<COMN>-3.27b-741: pssStartup.c[533]
Error getting value of Set Parameter: Level 2 OpLocks Enabled

Do I have an issue here? And are there any recommendations for maintenance tasks to be run after virtualising? Any steps I didn't do perhaps, specifically tuning NSS?

Many thanks,
Alan Thompson