What is trimmable "peaking"?
Well, the gate capacitance is driven by a voltage divider, output impedance about 2.5 ohms (that's what the 2.5 ohm resistor and 10 uF capacitor are for), and
that keeps the rise time (R*C) short.  The raw op amp output impedance is higher (40 ohms, perhaps?). That part, is just trading off the slew rate and output
voltage range (excess to needs) to get lower drive resistance.  As for the 'loop peaking' capacitor, it reduces the negative feedback.  This steals back some of the gain reduction that one needs for feedback compensation, and will result in oscillation if you go too far, so the 1k variable resistor is there, to tweak the feedback if it does oscillate.  That tweak is done while looking at a response curve, and dialed until the peak is flat...