gr-fosphor is choppy at audio frequency

Ignatius Rivaldi minecraft2048 at
Wed Apr 18 22:03:54 UTC 2018

I'm (ab)using gr-fosphor for audio spectrum visualization by using
float to complex because it is the most colorful spectrum analyzer
that I have. Unfortunately, for some reason gr-fosphor is choppy at 48
kHz, while it is smooth at rtl-sdr output, about 2 MSPS or so. Is
there any FFT configuration setting like other spectrum analyzer to
change how many FFT bins and the framerate?

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