Scenario:
- Copying 20 images from one bucket another  (basic s3 "copy" command), between 150kB and 250kB each.

Timings when copying to a bucket without notifications:
- Copying: 1.4 s ± 7.27 ms  (I'm timing it through several loops to get some stats, so we can see it's pretty much homogeneous)

Timings when copying to a bucket with notifications enabled (standard notifications to Kafka, without filters or anything):
- Copying: 9.51 s ± 34.9 ms

the latency is due to the fact that the latency towards the notification endpoint is added to the S3 latency.