-Per-frame delay, in microseconds. Default: 30000 (0.03 seconds.).
-.TP 8
-.B \-speed \fInumber\fP
-Speed of disk animation. Default: 12.0 er, units per second. Let's call them metres.
-.TP 8
-.B \-rotspeed \fInumber\fP
-Speed of disk animation. Default: 0.1 rads per second.