The followining link shound come in handy:

http://www.aeroportsdeparis.fr/en/pa...ecting-flights

I transferred 6 times through CDG in the past month and it can be a pain at times, expecially with the current additional checks.

The thing that suprprised me (and to which I found no explaination to this day) is that when you're transferring from 2E to 2F on top of the passport check you go through the full security screening again. But when you're doing reverse (2F to 2E, Schengen to non-Schengen, gates K in my case) you just go through passport control, no security whatsoever and that obviously speeds things up.

Currently even when transferring within 2E non-Schngen terminal you will still go through security, although there will be no passport control of course.