Citrix Performance Counter Recommendations

Reference from: http://www.tokeshi.com/index.php
Formatted into a table. Most of it is basic common sense and goes for any Windows server.

Counter	Recommendation
processor utilization	less than 90%
processor interrupts	average 100 per second
context switches	less than 500 per second
memory-available bytes	greater than 32 MB + 4-14 MB per user + 1 MB per idle session
memory-pages per second	less than 5
percentage of disk time	greater than baseline
disk queue length	1.5 to 2.0, >2 may mean disk hardware incompatibility or failure
NIC Bytes Total / second	less than network transfer rates