id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
10101	Improve JOSM performances with large datasets	ggeldenhuis	team	"Hi
I have a large dataset that I am busy importing. It is a shapefile that has had the following actions performed on it:
* Simplified ways in ArcGIS ( The choice of simplifications methods is better)
* Removed all but one field
* Re-projected for OSM/JOSM compatibility.

The shapefile was then imported into JOSM (7214) and saved as a OSM file.

My working methodology is as follows.
* Open OSM file
* Select data to import
* Remove tags (Slow)
* Copy data to clipboard (Slow)
* Create new layer
* Download from OSM
* Copy data
* Do corrections and further way simplification
* Upload to OSM
* Switch back to OSM file layer
* Delete data that was previous selected (SLOW, as in takes 2-3 hours with 100% CPU usage)

Josm keeps on working but it takes a very long time for certain actions to be performed, specifically the ones marked as slow.

I am using JOSM 7214 and the latest Java 7 available for Mac.
java version ""1.7.0_51""
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

Josm is started as follows: java -Xms4096m -jar Downloads/josm-latest.jar

I can share the original shapefile and/or the converted OSM file if it would help."	enhancement	new	normal		Core			performance