The Audit Collection Admin provides performance monitoring and trending of all ACS Collector and Forwarder performance counters.
Collector Performance View

Collector
1) Connected Clients
2) Database Queue % Full
3) Database Queue Length
4) DB Loader Events Inserts/Sec
5) DB Loader Principal Inserts/Sec
6) DB Loader Strings Inserts/Sec
7) DB Principal Cache Hit %
8) DB Requests Queue Length
9) DB String Cache Hit %
10) Event time in collector
11) Incoming Events/Sec
12) Interface Audit Insertions/Sec
13) Interface Queue Length
14) Registered Queries
Forwarder
1) Average Event Rate
2) Average Time to Collector
3) Connect Time
4) Current Event Rate
5) Disconnect Time
6) Last Action
7) Total Transmitted Events
8) Total Size of Transmitted Events
9) Recieved Packet Count
10) Recieved Packet Size
11) Seconds Since Last Connection