id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
18	Incremental loading of XML data from the server. Start displaying even when XML transfer is not finished.	imi	imi	"Progressive downloading would be nice, especally if the server implements the ordering of the transfered data so, that major streets comes first. Together with the ability to cancel the download, this gives nice options to the user to just get an overview of the current area.

map24.de do it this way.
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erik@tiq.com says:

This can't be done for map downloads, because they aren't downloaded this way, this would need changes to the main server. So the component JOSM i wrong.

But it would be wonderfull for GPX downloads, being able to cancel a trackpoint download would be great.
"	enhancement	closed	minor		unspecified		wontfix