Stockholm Arlanda terminal 2 - ARN

Is there any immigration/security fast lane:
YES

Only noticed this today as usually there is virtually no queue at security. About 50 people were queuing to go through security so the fast lane worked well for me as I normally only leave central Stockholm an hour before my flight is due to depart.

Upon boarding the ARN-AMS flight I estimate that 25% of passengers boarded as Sky Priority. This was being policed properly by the gate staff but I was surprised as I imagined that only about 10% of passengers on a typical flight had Gold/Plat/Elite+.