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Why is JRuby Slow?

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CommunityNews

Why is JRuby Slow?

Recently, I made some contributions to the continuous integration process for Jekyll. Jekyll is a static site generator created by GitHub and written in Ruby, and it uses Earthly and GitHub Actions to test that it works with Ruby 2.5, 2.7, 3.0, and JRuby.

The build times looked like this:

Ruby Version Jekyll CI Time
2.5 8m 31s
2.7 8m 33s
3.0 7m 47s
JRuby 45m 16s

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