boost converter diode
Reverse recovery time will "suck back" a slug of charge
on every cycle, that is a switching loss. There is only so
much energy to be delivered from the inductor and it should
all go forward, but never entirely does.
Diodes' series resistance is a conduction loss, including
but not limited to the rated Vf. Schottkies have a lower Vf
but often poorer series resistance.
If the diode's capacitance makes crazy ringing, that can also
cost you extra. Below-ground ring cycles tend to be a total loss.
It may be more helpful to think in terms of inefficiency,
tabulate the various loss elements and work from that.