JOSM slow with MapCSS on openSUSE systems

[stoecker]

Hello,

today I did a bit of maxspeed mapping and used the maxspeed style.

As soon as following rule kicked in, JOSM became awfull slow:

/* 6.3 - report conditional maxspeed without default maxspeed */
way["maxspeed:conditional"][!"maxspeed"]::maxspeedlayer,
way["maxspeed:forward:conditional"][!"maxspeed:forward"][!"maxspeed"]::maxspeedcasinglayer,
way["maxspeed:backward:conditional"][!"maxspeed:backward"][!"maxspeed"]::maxspeedcasinglayer
{
        color: yellow;
        dashes-background-color: red;
        dashes: 4,24;
        opacity: 1;
        width: 5;
        text: tr("conditional maxspeed without default maxspeed!");
        text-color: black;
        font-size: 11;
        text-halo-color: red;
        text-halo-radius: 2;
        left-casing-width: 1;
        left-casing-color: yellow;
        right-casing-width: 1;
        right-casing-color: yellow;
        left-casing-opacity: 1;
        right-casing-opacity: 1;
        z-index: 1;
}

It seems the text rendering is causing an extreme slowdown. For some time now JOSM seems slow to me on openSUSE systems, but I couldn't nail down the reason. As far as I can see it independent from the java version, but for reference here is what I used (recent openSUSE Tumbleweed).

openjdk version "1.8.0_212"
OpenJDK Runtime Environment (IcedTea 3.12.0) (build 1.8.0_212-b4 suse-2.2-x86_64)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

To be able to use josm at all I disabled display of most area styles.

I'd appreciate if someone with a bit more skills in timing debugging could test openSUSE. If this is not a generic JOSM issue (which I don't believe, otherwise there would be much more complains) it must have a reason in something different in modern openSUSE distributions.

[Don-vip]

What happens if you remove the text-halo properties?

[Don-vip]

Also, please try with Java 11. Java 2D rendering has completely changed in Java 9.

[stoecker]

Last time I tried it did not help, but you're right. With java 11 JOSM is as smooth as I know it. Now I have a java11/8 mixup, as the compilers still need to be 8 for compatibility :-)

[stoecker]

I'll think about a way to ensure that java > 8 is used for the JOSM opensuse package.

[stoecker]

JOSM is now started with this commandline. This uses default java except lower than 11. In this case it tries java 11 if existing.

LIBXCB_ALLOW_SLOPPY_LOCK=1 `perl -e '$res = "/usr/lib64/jvm/jre-11-openjdk/bin/java"; $res = "java" if !-f $res || qx(java -version 2>&1) !~ /version \"(\d+)/ || $1 >= 11; print $res'` -Xms64M -Xmx1024M -XX:+UseParallelGC -XX:+UseAdaptiveSizePolicy -jar /usr/share/java/josm-tested.jar "$@"