id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
14025	Merge layers is too slow	naoliv	team	"Open all the shapefiles from the attached example and start merging the layers, one by one.
There is a time that it get extremely slow to merge two layers.

With visualvm it's possible to see that most of the time it's executing `isUninterestingKey()`

[[Image(https://i.imgur.com/iEfuVN4.png)]]

Isn't it possible to have a faster merging process here?

JOSM:
{{{
URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-11-20 17:33:33 +0100 (Sun, 20 Nov 2016)
Build-Date:2016-11-21 02:34:51
Revision:11288
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11288 pt_BR) Linux Debian GNU/Linux unstable (sid)
Memory Usage: 247 MB / 4029 MB (101 MB allocated, but free)
Java version: 1.8.0_111-8u111-b14-3-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u111-b14-3
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-11
VM arguments: [-Dawt.useSystemAAFontSettings=on]
}}}"	enhancement	closed	normal	16.12	Core		fixed	performance