I will fly BA (F) LHR-PVG with a 1 hour 55 min connection onwards PVG-HKG on KA (C). I assume by what I have read that I will have to pass through immigration and check-in again, so I was was wondering if the following actions would save me some time:

1. Print out boarding pass for KA flight beforehand.
2. Travel with hand luggage only.

I would assume that I then could go straight through securtity without checking in, since I'd already have the boarding pass and only hand luggage.

(Also, does anyone know if flying First Class helps me in this case?)