[HP49G] Very poor graphing performances

[Bruno]

Thanks for your answer Han,
I think they are at least 2 reasons since the extra time (vs the GX) are too different for the WIREFRAME (47% slower) and PS-CONTOUR (260% slower!!) graphs.
One common reason could be the hardware and/or the operating system implementation difference beetween the HP48GX and the HP49G,
and another reason specific to the PS-CONTOUR graph could be the different implementation of the 'differentiate' function (rewritten for the CAS ?)
used by the PS-CONTOUR algorithm.

I'm amazed that nobody was shocked before.