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After trying to improve the Ruby Mustache implementation, we finally chose the Crystal-Lang one.

With some complex template, Ruby implementation can be very slow (~700ms). For the same template / dataset, Crystal version is around 3ms! It can be faster but we are loosing time by launching binary file.

Crystal is a language which looks like Ruby but is not Ruby. We are thinking migrating a lot of things from Ruby to Crystal when it will hit version 1.