iPhone 6s plus 64 Gb (space grey)
Same problem when configured as new iPhone (no restore).
My fix so far:
1 - Restore and update to 9.1 with iTunes (no OTA update).
2 - Remove all configured touch id fingers;
3 - Try unlock the phone with passcode (0 fingers configured), no lag.
4 - Configure one finger, tested, no lag;
5 - Configure 4 fingers and so far no lag.
Cheers,
Zé
Same problem when configured as new iPhone (no restore).
My fix so far:
1 - Restore and update to 9.1 with iTunes (no OTA update).
2 - Remove all configured touch id fingers;
3 - Try unlock the phone with passcode (0 fingers configured), no lag.
4 - Configure one finger, tested, no lag;
5 - Configure 4 fingers and so far no lag.
Cheers,
Zé