DSP Robotics Support

Can someone correct me?

FS apps are using single core. Which means, that on my C2D when I reach 50% CPU usage - I start to notice audio glitches and more painful interruptions.

Just a few minutes ago, I added a tool to my interface, that seems to consume some percentage of CPU, but... Well - it does not affects the audio, (which is good) and CPU readings are showing more than 50% usage.

So, my question is. Graphical interface uses GDI+ routines (whatever that means). Are these grahical routines calculated by second CPU core via more general windows interface? Or - are greens calculated via multicore while streams via single core? On interpolated FFT (to 64kpts here, in greens) I have 10-20% difference in general CPU usage, but almost the same amount of audio is working glitchless.

You're pretty much there...
GDI+ is a set of graphic routines that come built into Windows - to save programmers from having to "re-invent the wheel" when they want to display simple text and graphics.
FS green/stream etc. will always share the same single CPU core, but Windows is still free to assign FS and GDI to different cores if it wants to.

Good to know and good that it happens this way. Visuals are not used in rendering/processing mode, so they kick other CPU cores only during interaction with user.