“ Our benchmark results show that Apache Beam has a noticeable impact on the performance of DSPSs in almost all cases. Programs developed using Apache Beam suffered from a slowdown of up to a factor of 58 in the worst case. At the same time, there is one scenario where the query developed using Apache Beam is about as fast as its counterparts using the APIs of the corresponding DSPS. However, for most scenarios we observed a slowdown of at least a factor three.”