Never knew the input functions as a capacitor, thank you for the explanation, I'll change to 150 Ohms.
Its not exactly like a capacitor - the charge is partly capacitive, and partly used to balance the
channel region forming between source and drain. Higher drain currents require larger amounts
of charge on the gate. In fact the gate voltage has a plateau as the drain current increases
during the turn-on process - charge is needed to enlarge the active channel.
For fast switching of large currents a MOSFET driver chip is usually used and these provide between
100mA and several amps depending on the size of device you intend to drive!