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Gave this a quick shot on my own monolithic app and it cut startup time almost in half. Impressive considering how easy it was to configure!

Startup time was one reason we started migrating away from Rails in a previous workplace, between frustrating startup time in development and test and occasional quirkiness of zeus and spring. Bootsnap would have been a godsend.

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I've tossed around the idea of writing zeus again now that I actually understand the language I wrote it in. Spring is much simpler, but because of the manner in which it's loaded, it isn't capable of detecting certain types of file change, which reduces developer confidence in it.

Zeus is capable of detecting any sort of invalidating file change, but is pretty buggy (or at least was historically -- the Stripe guys improved it a lot after I stopped working on it).

Still fairly buggy,some terminal issues should be fixed now but reloading has race conditions still.

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