This Antivirus program has just sent out an upgrade for users which is slowing down Infusion dramatically.
In addition to the Standard Exclusions, Please do the following
Go to Advanced Setup
Check the Existing Exclusions are correct
Add to Process Exclusions (if this is not an option you will need to upgrade the Program to Version 7 or higher)
Also add the correct paths into this area as well.
It may be necessary to restart the computer for these changes to take effect.