I would suggest you change your tranny fluid and filter... alot of time when
you have wierd/abnormal shifting responses... it is usually due to dirty
fluid or clogged filter.

This tranny should be electronic, so there is nothing you can do unless they
have new software to download for the shifting characteristic improvement.

John asked:

I've got an old '99 C230 Kompressor sedan (2.3L) and it takes just
about one heartbeat in the worst case to downshift and go.  To
compensate, I just leave the house a few seconds earlier every morning
(<- joke).

If I need to drag race the Lice-Boi in the next lane (and he looks
'serious' - oh my, nice tail pipe...), then I'll touch the gas pedal to
bring the revs up to about 1200rpm and there is no lag (none, nada,
zip) when it is time to go. On the highway, it is trivial to press the
peddle a half-second earlier.

On those rare occasions where the udder guy beats me to the punch due
to the slight delay, the small headstart is usually flipped within a
few car lengths (for a typical Lice-Boi).

One tip - tromp the gas pedal very quickly because the computer takes
you more seriously if the pedal travels down more quickly.  If it is
like my car, the pedal is just connected to a variable resistor under
the hood (fly by wire).

Maybe the problem is not  from the transmission, sounds more like a faulty
air mass meter, blocked cats etc. changedown should be pretty quick, only
slower at certain speeds, when its changing down  2 gears.What makes you
think its the transmission?