ALDI/LIDL are outliers here in Germany. Other supermarket checkouts like Rewe, Edeka, and Kaisers are slower at scanning items. So don't take the speed of ALDI/LIDL cashiers to be indicative of every supermarket checkout in Germany.

Overall, German supermarkets scan items faster than in North America, but ALDI/LIDL are really in their own league. I sometimes think they are faster to scan items than to drop the contents of the belt onto the floor. Impossible to pack in real-time!