Every time you switch that capacitance you spike either
the power or the ground rail and this has to damp out,
if indeed it can; ground kicks especially get into all kinds
of other things (like your reference voltage, your current
sense, etc.) and can initiate large signal instability even
in "small signal stable" loops.
The higher you make power network C and Q (in the
interests of efficiency and noise) the longer it's going
to take the bypassing to "ring down". And I've seen
this (unsettled VDD) cause polymodal duty cycle
instability as it sneaks into the high side current
comparator of an integrated buck converter. All
stemming from the supply ringing that followed a
preceding switch event.