id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
20658	Possible performance improvement with downloads?	GerdP	team	"I've noticed a few cases where the processing of downloaded osm data consumes a lot of CPU time, esp. with the `MultiFetchServerObjectReader`. I think the reason is that we store packages of primitives in `DataSet` instances. Class `DataSet` maintains a spatial index. For this index the bounding box of ways and relations is computed and - in some cases - recomputed frequently while more data is downloaded and merged. If I got that right some actions would be much faster if we could avoid to maintain the index and the bounding boxes until the data is finally rendered.

My idea is to change class `DataSet` to fill the spatial index only when it is used. Work in progress..."	enhancement	closed	normal		Core		wontfix	performance download	Don-vip stoecker simon04