OK, found why such a high rate (reported with correct COM port by the excellent Xport app) XPort
Got the hint by reading the thread on BU-353 mentioning SIRF mode...
was set in the high speed binary SIRF mode instead of classical NMEA
Now the Sirfdemo app at
lets you switch between these two modes (at least on my trusted HI-204 III) but the steps are too complex to be described here... (who cares anyway...)