High Memory,Disk and CPU usage on WSM Server

Hi,

We have Core Server 8GB of RAM and Edge Server 0n 2008 OS,

And SQL 2008 on WSM Core Server,

We have 70 clients using Core Server,

We found that the Memory, Disk and CPU usage on WSM Server very High,

And clients Boot Time takes extremely long time up to 20min until the logon screen appears

Can anyone help me!

Thank You