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.

https://github.com/agbell/jekyll-perf

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.