Application extreme sluggish

[anonymous]

What steps will reproduce the problem?

1. Open JOSM and retrieve OSM data
2. Pan or zoom the map

What is the expected result?

Map is zoomed or panned promptly

What happens instead?

It takes around 30 sec for panning the map. Zooming seems to work in 20 secs. The map only includes a couple ob blocks, so rather small. The sluggish behaviour was not the case in earlier versions. I don't know exactly since which version this happened.

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-11-28 01:09:01 +0100 (Wed, 28 Nov 2018)
Build-Date:2018-11-28 00:26:41
Revision:14460
Relative:URL: ^/trunk

Identification: JOSM/1.5 (14460 en) Linux openSUSE Leap 15.0
Memory Usage: 409 MB / 910 MB (145 MB allocated, but free)
Java version: 1.8.0_181-b13, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1680x1050
Maximum Screen Size: 1680x1050
Java package: java-1_8_0-openjdk:x86_64-1.8.0.181
Dataset consistency test: No problems found

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.

[GerdP]

You are not using the latest tested version. Please update first and - if the problem remains - let us know what data you are downloading.

[Matt <Matthias.Wirtz@…>]

Hi,

I did already test it with the latest version too. Version 14620 from 2018-12-31. Same behavior here.

I'm downloading e.g. the following bounding box: 49.47, 8.47, 49.48, 8.48.

I figured out that the effect is worse if zoomed in.

Thanks for looking at this.

[GerdP]

I cannot reproduce a performance problem here with the JOSM default mappaint style. Maybe you use other styles?

[Matt <Matthias.Wirtz@…>]

I'm using the JOSM default (MapCSS) Map Paint Style.

When I deactivate all Map Paint Styles then the Map reacts as normal, all zooming and panning occurs promptly.

If I use either Potlatch 2 or JOSM default (MapCss) the map gets sluggish.

Might there be an JRE related issue? Which version are you running?

[GerdP]

I am using java version "1.8.0_191" (from Oracle) on Windows, so yes, try to update first.
Besides: Your area contains a lot of rails which means a lot of dashed lines. Please check if the problem disappears when those are not visible. Do you see high CPU usage when JOSM is slow?

Just to make sure: You did not mention background images, so this is really about rendering the OSM data, not the background images? With many background images you may run out of memory and that always slows down everything.

[Matt <Matthias.Wirtz@…>]

I don't have background images. CPU load is high when JOSM is slowing down.

Since I don't know how to upgrade my java version and I figured out that I can work pretty much around the problem by not using the critical zoom levels I close this issue.

Thanks for quick help.

[GerdP]

OK. You may try to find out in what routine JOSM is so busy. Try VisualVM, it is quite easy to use.