Extrusion Speed setup?

[EagleSeven]

I Know that 'feedrate' is amount of filament being pushed thru nozzle , or how fast the stepper-motor turns,
and I think 'print-speed' is also.
One of the easiest ways to get frustrating prints is by having a feedrate that is too fast. If you’re printer extrudes at 20mm/sec and you’ve got it set at 30mm/sec, the filament will get stretched too thin, as it comes out of the nozzle.
Of course nozzle size also effects that greatly.