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perennus

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I tried it last week actually with OpenJDK15+Windows. With JDK16, IntelliJ didn't boot.

-XX:+UseZGC: Memory usage for my project dropped to a constant 600 megs. Using the IDE felt just as fast as the normal experience.

-XX:+UseShenandoahGC, -Xmx4g. Shenandoah GC used a constant 4 gigs of ram. It was a slower user experience for me.

In the end, I went back to the default settings, because the custom JDK changes the look and feel and I don't like it.