Many thanks for the answer.
I have another question: In the comparison there is 30 second of maximum (theoretical) time for confirmation. However some say, that currently it takes longer, 1-2 minutes or even more. Is it possible to reduce the time in the future?
To get your transaction confirmed, you need that a majority of witnesses post a transaction after yours. Since the witnesses also pay fees for their transactions, they need to wait that enough transactions has been posted for collecting enough fees in order to not lose money. That's why the network isn't working at full speed yet, confirmation time will become better along with number of transactions increases.