yeah, Heroku infamously had a really hard time getting Ruby to scale well. Ruby traded safety (GIL) for absolutely speed, although it should be noted that Ruby

yeah, Heroku infamously had a really hard time getting Ruby to scale well. Ruby traded safety (GIL) for absolutely speed, although it should be noted that Ruby's C interfaces do allow you to op out of the GIL, which means if speed is absolutely paramount you can write a Ruby C extension to opt out of it. I've done it in the past, but OTOH if you're to that point maybe Ruby no longer makes sense.