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I have similar observations but without any hardware. The WX FFT totally
locks my Athlon 64 3800+, when displaying.
Just signal source -> FFT sink.
BUT - only the WX FFT. The QT FFT seems rather reasonable in performance
demands.
Try turning down the display rate in the WX FFT display--by default it's
set to 30 FPS. I generally run mine with
5 FPS or less, and turn on averaging, with an alpha of 0.1 or smaller.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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