Will the speed be throttled at some point?

No. 

In normal use, the speed is not artificially throttled.

However, excessive use can lead to capacity problems, which directly affects other mobile subscribers. So we ask you to use the mobile internet in a reasonable way.

We reserve the right to temporarily lower the priority of data traffic in extreme cases. This means that in places and at times of day when the mobile network is overloaded, the speed will be reduced.

This is generally only noticeable in data-intensive activities. 

In antenna cells that are not overloaded, deprioritization does not affect the speed.