skip precompiling of all assets on the first request for any asset #29902
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follow-on to #29878. via simple but hard-to-find configuration change, tell rails sprockets to just compile assets on demand rather then compiling every asset on the first request for any asset.
This further reduces the time to load the first request to http://localhost-studio.code.org:3000/home from 72 seconds to 13 seconds (!!) according to development.log.
super-unhelpful documentation for this setting: