Unusable drawing performance in maximized mode even with small area

[overv161@…]

I'm using JOSM 8491 on Windows 8.1 64-bit with Java 8. When running the application in maximized mode at a resolution of 2560 x 1440 with a very small region of a city, I get a framerate of about 3 (yes, three) while moving the map. See the screenshot that has been attached.

Hardware:

CPU: Intel Core i5 2500K overclocked to 4 Ghz
GPU: Sapphire R9 290 4GB
RAM: 8.00GB Dual-Channel DDR3

This causes JOSM to be unusable for me to edit any dataset larger than 3 buildings.

[overv161@…]

Screenshot of JOSM at 2560 x 1440 resolution

[Don-vip]

"Java 8" is not enough, can you please attach a status report with exact version of Java, as asked on newticket?

Some other questions:

• Are you up to date with your graphics drivers?
• Does the wireframe mode improve the performance?

[anonymous]

Sorry, I missed that.

Revision: 8491
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: Don-vip
Last Changed Date: 2015-06-16 23:27:08 +0200 (Tue, 16 Jun 2015)
Build-Date: 2015-06-16 21:45:58
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 8491

Identification: JOSM/1.5 (8491 en) Windows 8.1 64-Bit
Memory Usage: 93 MB / 247 MB (25 MB allocated, but free)
Java version: 1.8.0_51, Oracle Corporation, Java HotSpot(TM) Client VM
Dataset consistency test: No problems found

Answers:

1. Yes, and not running the beta drivers.
2. Yes, massively. I estimate that the framerate is 25 in wireframe mode.

[anonymous]

The framerate rapidly decreases as more of the screen is filled with the striped background in wireframe mode.

[Don-vip]

Thanks. Do you launch JOSM via WebStart? If so, can you please try with command line java -Xmx2048m -jar josm-latest.jar in order to increase allocated memory?

[anonymous]

No, I was using josm-tested.jar. Java couldn't allocate a 2 GB heap for some reason, so I changed it to 1.2 GB. I ran it with your command line arguments, but it didn't change anything.

Output:

Memory Usage: 91 MB / 1160 MB (13 MB allocated, but free)

[anonymous]

If I run it as:

java -Xmx1024m -Dsun.java2d.opengl=true -jar josm-tested.jar

Then the main window shows up as a white screen. If I add the fbobject flag:

java -Xmx1024m -Dsun.java2d.opengl=true -Dsun.java2d.opengl.fbobject=false -jar josm-tested.jar

Then it works fine, but there is no performance difference.

[bastiK]

In the preferences under Display settings (first symbol) > OSM Data > Draw boundaries of downloaded data, you can disable the striped background. Does that make a major difference when using the default map style? How does it compare to the Potlatch 2 map style?

[overv161@…]

Disabling the striped background makes no noticeable difference. Neither does switching between Potlatch 2 and JOSM default.