Boost converter efficiency

Hi team,

I have designed the "LT3579EFE#PBF" as a Boost converter to step-up the voltage from 3.3V to 12V.

The circuit is designed as shown in the figure, but it has a low efficiency of 66% at 600mA load current.

Although the efficiency is not up to 90%, I wonder it can produce similar efficiencies.

If possible, please give me a feedback what is wrong with the circuit in the picture.

Thank you in advance.

Contents modification 1
[edited by: SHLEE at 4:43 AM (GMT -5) on 3 Mar 2021]