I've transferred from a non-Schengen flight in terminal 2E to a Schengen flight at terminal 2D last week and was very surprised by the inefficiency of the whole process:
- First there's a security check for people who transfer to other terminals
- Then you have to take the bus to a different terminal and since 2D is just one stop behind 2E, you essentially have to drive through every stop at CDG before you can get to 2D
- At 2D there's passport control as expected, but then your only option is to exit to the public area instead of transferring to your gate
- Since you've exited to the public area there's now a second security check you have to do
Is there a faster way to do the same transfer? I will fly again on this route soon and would prefer to find a better route. 2D to 2E is only 20 minutes, while the other way around took me 1 hour, so I hope a better path exists.
Note that this isn't a duplicate of this question as in this case the transfer is the other way around.