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The linked blog post has some details: https://lichess.org/@/thibault/blog/lichess-on-scala3-help-n...

Also see previous HN discussion (top comment is the solution):

https://news.ycombinator.com/item?id=33865932

Yeah, literally the first thing you do when running into JVM issues. It was my second initial suggestion in Discord as well.

Would be interesting to see if this application would benefit to switching the JVM from openjdk to Azuls “high performance” JVM.

Rather than use a big bang deployment. Setup an A/B test, and gather a sampling of data.

I haven’t been able to truly test azul’s claims yet. Java apps that I manage/deploy were on a small scale in regards to requests/sec and I personally didn’t see much difference.

Azul Zing is quit expensive at minimum $15K/year. While Lichess might be able to get it for free under some promotion deals, it would not make sense to tune an OSS projects for such an expensive option since most users won't be able to use it.

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