SQL Server performing slow I have a Microsoft SQL Server running on an IBM server with 10 cores and 64 GB RAM.

I have from 100 to 300 users working concurrently on the server.

Users complain about slowness of the application.  I've checked the server and found CPU usage is 6%, RAM usage is 4GB, and network usage is up to 1Mbps.  I have a 4Mbps dedicated line.

I've tried to collect other information on the server such as Blocking and Wait Statistics:





The Average resource wait time is 40 sec.

I am unable to interpret the cause. Can anyone suggest a way to resolve this?

If any further information is required, I can provide that.

EDIT: 

As suggested, I've added the following items:

Page Life Expectancy 3



IO stats Snapshot



Wait Statistics



Server information



Memory status



Query Execution List
Following discussions in chat, we've established:


32bit Enterprise SQL Server.
3.5GB of memory in use (no AWE/PAE).
2.1GB database with 1.3GB buffer pool.
Page life expectancy of 3 seconds.


Suggested fixes are:


AWE/PAE as a quick fix so the database fits in memory.
Investigate the frequently called, highest IO queries identified.
Consider rebuild to 64bit.