[OpenJDK 2D-Dev] LineBreakMeasurer 7-70x slower on Java 10 compared to Java 8

Philip Race philip.race at oracle.com
Sat Sep 8 22:02:57 UTC 2018

You missed https://bugs.openjdk.java.net/browse/JDK-8202131

It is on my to-do list ..


On 9/8/18, 1:55 PM, Eirik Bakke wrote:
> Hi, 2D-dev.
> Switching from Java 1.8.0_172 to Java 10.0.2, at least on Windows 10, 
> it has become very expensive to call LineBreakMeasurer.nextLayout--it 
> takes about 0.8ms to render any string, even if it's just a single 
> character. That's between 7 and 70(!) times slower than on Java 8, 
> depending on how many strings you need to render. See the following 
> performance test (my results pasted at the end):
> https://gist.github.com/eirikbakke/81eec72221c9d7d8fc0b4afa9c54a163
> This is a problem in our visualization app, which uses 
> LineBreakMeasurer to produce a TextLayout once for every cell in a 
> large spreadsheet-like data layout. Operations that were previously 
> quick or instantaneous now introduce bad latencies in the user interface.
> I saw the related bug https://bugs.openjdk.java.net/browse/JDK-8186317 
> and its duplicate https://bugs.openjdk.java.net/browse/JDK-8196666, 
> but they are both closed.
> Is this a known regression, and are there any plans to fix it?
> -- Eirik
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