I just double checked your issue on my three systems. Can't confirm this. My CPU is from 0% to max 0.6% usage for Magician (4.4) I also use RAPID on one of my Samsungs SSDs.
Sounds to me like there's some sort of conflict causing Berry's Magician installation to use clock cycles like that.
I just checked my sig rig. Keep in mind that it wouldn't be an apples-to-apples comparison, since our systems may differ in various ways.
But with RAPID running, Magician 4.4 loaded to sys-tray and then activated by double-clicking the sys-tray icon to bring up the application, the two "Magician" entries in my Processes list show virtually 0% in CPU usage.
What would any others suggest? Perhaps he should get Latency Monitor? Or find a tool that will reveal what programs/processes/services might be interacting with Magician . . . delayed procedure calls? Interrupts?
Maybe . . . uninstall Magician? Pause his AV/Firewall and install it again?