download only streets, buildings incl addr and some amenitys (choosen by me/task specific)
OR
set the correct filters that you only see the above mentioned ones
Some times in city areas there are so many nodes for hundrets of different things that it can get a bit confusing if you work in such areas, and it slows down my pc, and the data is a lot bigger.
Never tried this, but I would try to query the desired data via Overpass_API, download the result as an OSM-File, load the file into JOSM and upload the changes to OSM.