add bootsnap to speed up test and dev

Gemfile

@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 #source 'http://production.cf.rubygems.org'
 
 # does not install in linux ATM, so hack this for now
-# gem 'bootsnap', require: false
+gem 'bootsnap', require: false
 
 def rails_master?
   ENV["RAILS_MASTER"] == '1'

Gemfile.lock

@@ -62,6 +62,8 @@ GEM
       rack (>= 0.9.0)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
+    bootsnap (0.2.13)
+      msgpack (~> 1.0)
     builder (3.2.3)
     bullet (5.4.2)
       activesupport (>= 3.0.0)
@@ -398,6 +400,7 @@ DEPENDENCIES
   barber
   better_errors
   binding_of_caller
+  bootsnap
   bullet
   byebug
   certified

config/boot.rb

@@ -10,15 +10,18 @@ ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
 
 require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
 
-if false && ENV['BOOTSNAP'] #&& ENV['RAILS_ENV'] != 'production'
+
+if ENV['RAILS_ENV'] != 'production'
+  is_mac = !!(RUBY_PLATFORM =~ /darwin/)
+
   require 'bootsnap'
+
   Bootsnap.setup(
     cache_dir:            'tmp/cache', # Path to your cache
-    development_mode:     ENV['BOOTSNAP_DEV'] == 'development',
     load_path_cache:      true,        # Should we optimize the LOAD_PATH with a cache?
     autoload_paths_cache: true,        # Should we optimize ActiveSupport autoloads with cache?
     disable_trace:        false,       # Sets `RubyVM::InstructionSequence.compile_option = { trace_instruction: false }`
-    compile_cache_iseq:   true,        # Should compile Ruby code into ISeq cache?
-    compile_cache_yaml:   true         # Should compile YAML into a cache?
+    compile_cache_iseq:   is_mac,      # Should compile Ruby code into ISeq cache?
+    compile_cache_yaml:   is_mac      # Should compile YAML into a cache?
   )
 end