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As usual before a Java release, I'm listing all the new performance features in the upcoming release, this time for Java 21 (I have done this every 6 months prior to each new release, you can track back to the previous February and August newsletters if you want to see what's new performance-wise in any particular release). Each time I give the new features, the performance benefits from each feature, and how to use the feature.

Java 21 is a long term supprt (LTS) release, so the speculative changes have been kept small (because they'd need to be supported a long time). In fact as far as performance goes there is just one significant new feature - but it's huge! Virtual threads have finally arrived!

Now on to the details of those Java 21 changes, including the options you have available to use them. And of course the tips from this month's articles, as ever are extracted into this month's tips page.

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Last Updated: 2024-06-30
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