1ec5 left a comment (openstreetmap/openstreetmap-website#7054)
If I’m not mistaken, /map includes any relation that has a member within the
requested bounding box, but the relation is still incomplete. You aren’t
rerequesting highways all across Switzerland just because the E60 runs through
there. That’s still a lot of member IDs though.
The most recent time I hit openstreetmap-cgimap’s bandwidth limit was a couple
months ago attempting to move a GNIS-imported POI about 30 kilometers in
iD, panning by screenfuls pretty rapidly [along a major highway
route](https://www.openstreetmap.org/way/961140460) in an area with very dense
building coverage. (I used to have an amazing workaround to avoid any panning
at all, but it no longer works.) The rate limiting began about
20 kilometers into it. I ended up having to wait a bit between each
screenful. It didn’t occur to me that the highway route might’ve been the issue
(along with several intercity bus routes that follow the highway route).
It’s a lot easier to hit the limit in OpenHistoricalMap, which uses relations
much more heavily. Fantastically dense and complex boundary relation coverage
(like in San José, more than a thousand times of what’s in OSM) forced us to
increase openstreetmap-cgimap’s limits in OpenHistoricalMap/issues#860. That
mitigated the rate limit for now, but it’s still a poor experience for anyone
editing on a less powerful computer.
If the (incomplete) relations are driving rate limits in OSM, then I’m
picturing a bandwidth optimization in the form of an option on /map that
fetches all the map data in the bounding box, including the IDs of parent
relations, but not the relations themselves. Then an editor could decide to
multifetch the relations by ID in a separate request as necessary. The downside
would be additional requests and probably more work on the server side.
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