One thing to do is check what services are running in the background.

My wife complained that Outlook was unbearably slow, and with her
login Outlook was taking twice as long to do anything. I checked the
running process and found a Media Player service using up 50% of CPU.
I check its options and Media Player was configured to pull a bunch of
information from the network. I turned all those things off and the
service stopped noticably using CPU.

The other thing I noticed is that for the first three days after
upgrading, the Windows Search Protocol Handler (or something with a
similar name) was busy indexing the everything in Outlook and BCM.