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This piece doesn't have much substance. tl;dr; starting a huge VM takes time.

JRuby and it's active maintainer @headius have been great to work with. Surprisingly a very vibrant and active community.

That seems unfair. Even after warm-up time Jruby and truffleruby are still slower and the truffleRuby folks are investigating it.

I thought looking into why something was slow was worth writing down as a blog post.

There are/were imperfect cheats to reduce startup times like nailgun, drip, and spork.

The biggest gotchas in JRuby are finding alternatives to native extensions and memory use. What's neat is plugging into JMX from Ruby land.