Update:
Looks like what
@Elsa Zoya mentioned is true. Got my parents visa approved in 3 weeks.
Details:
My parents living in India, I applied as representative for them on Dec 05th in the portal. Got biometrics letter on the same day.
Scheduled for 08thDecember.
Received passport submission on 15thDecember.
Submitted passport on 29th December
Received stamped passport on 03rd Jan.
processing time took only 2 weeks. but i submitted passport little late.
Thank you everyone.