If you use #OpenTripPlanner #Valhalla or #MOTIS for routing on top of #OpenTripPlanner, you are likely regularly downloading "*.osm.pdf" files.
Some of these are huge and slow to download. But there's a way to download 99% less data, speeding up the process a lot.
Add pyosmium 4 to your workflow and it can patch these files instead of doing full re-downloads. Works great with GeoFabrik!
https://docs.osmcode.org/pyosmium/latest/user_manual/10-Replication-Tools/
CC: @felixguendling