Merge layers is too slow

[naoliv]

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()

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]

[simon04]

In 11290/josm:

see #14025 - Merge layer: log duration

[simon04]

In 11291/josm:

see #14025 - Store workinprogress/uninteresting/discardable keys in HashSet

[simon04]

In 11292/josm:

see #14025 - Merge layers performance: run quick/decisive checks first

[simon04]

For merging manchas-urbanas and vila
r11289: Merge layer completed in 5 min 39 s
r11292: Merge layer completed in 1 min 18 s

[Don-vip]

Milestone renamed