-# Set up gems listed in the Gemfile.
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
-
-require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
+require "bundler/setup" # Set up gems listed in the Gemfile.
+require "bootsnap/setup" if ENV.fetch("ENABLE_BOOTSNAP", "true") == "true" # Speed up boot time by caching expensive operations.