Before/after adding bootsnap

bootsnap.log

$ # Before bootsnap
$ time DISABLE_SPRING=1 bin/rails r 'exit 0'
real	0m7.030s
user	0m4.429s
sys	0m2.499s

$ # Adding bootsnap
$ git diff -u
diff --git a/Gemfile b/Gemfile
index b6b7854cf..445cb572f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,9 @@ source "https://rubygems.org"
 # production to load env variables into the app.
 gem "dotenv"
 
+# For speeding up the Ruby/require boot process
+gem 'bootsnap', require: false
+
 # Include rails gems individually so we don't include `actioncable`
 gem "activerecord"
 gem "actionpack"
diff --git a/Gemfile.lock b/Gemfile.lock
index c10976b46..09a3da63b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -74,6 +74,8 @@ GEM
     base62-rb (0.3.1)
     bcrypt (3.1.11)
     benchmark-ips (2.7.2)
+    bootsnap (1.1.5)
+      msgpack (~> 1.0)
     brakeman (4.0.1)
     bugsnag (5.4.1)
     builder (3.2.3)
@@ -477,6 +479,7 @@ DEPENDENCIES
   base62-rb
   bcrypt
   benchmark-ips
+  bootsnap
   brakeman
   bugsnag
   bundler-audit
diff --git a/config/boot.rb b/config/boot.rb
index 1e6be380a..d4e267b7e 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -2,6 +2,9 @@
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile", __FILE__)
 require "bundler/setup" if File.exists?(ENV["BUNDLE_GEMFILE"])
 
+# Do all the boot optimizations
+require 'bootsnap/setup'
+
 # Must be a load so we can load again during reloads.
 load File.expand_path("../dotenv.rb", __FILE__)

$ # After bootsnap
$ time DISABLE_SPRING=1 bin/rails r 'exit 0'
real	0m3.455s
user	0m2.444s
sys	0m0.872s