We have been using Abyss in lieu of IIS sind the roll out of Ver 9 Beta 1 and have experienced no slow down or other issue as comparred to IIS. We are running on vmWare slice - Windows Server 2008 R2 with 5Gb of Ram allocated. 
BY SIZE
BY DEPLOYMENT
BY EDITION
BY INDUSTRY
SUBSTANTIAL SAVINGS
FREEDOM OF CHOICE
REMOTE WORKING READY
BOOST PRODUCTIVITY
TRIED AND TESTED
GETTING STARTED
ADVANCED
