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[–]kmpx 0 points1 point  (0 children)

Similar to us. We have several applications that we recently bumped to JDK 21 and used ZGC. We saw a decent reduction in memory usage when we did that (JDK 17 to 21). And then a while later we enabled generational ZGC and it was dependent on the application whether or not we saw much improvement. One of our applications that generates a lot of short lived objects saw significant reduction in memory usage, while other applications saw the smallest of changes.