[amibroker] Why is AB constantly taking up between 20-40% of my CPU?

[potatosoupz]

Even over the weekend when no data was coming in, it just sucks the CPU up. I 
have dual core Opteron machine, with 4GB of RAM and am running Windows 7. I'm 
finding AB to be very slow, even right clicking on a chart there is a 1 second 
delay for the menu to appear. What is the reason for this? Is this normal?