rubocop-with-bootsnap.diff

diff --git a/exe/rubocop b/exe/rubocop
index abf88369e..9491ded7f 100755
--- a/exe/rubocop
+++ b/exe/rubocop
@@ -3,6 +3,9 @@
 
 $LOAD_PATH.unshift("#{__dir__}/../lib")
 
+require 'bootsnap'
+Bootsnap.setup(cache_dir: '/tmp/rubocop/', load_path_cache: false, autoload_paths_cache: false)
+
 require 'rubocop'
 require 'benchmark'
 
diff --git a/rubocop.gemspec b/rubocop.gemspec
index 96096e6d0..431d4c800 100644
--- a/rubocop.gemspec
+++ b/rubocop.gemspec
@@ -33,6 +33,7 @@ Gem::Specification.new do |s|
     'bug_tracker_uri' => 'https://github.com/rubocop-hq/rubocop/issues'
   }
 
+  s.add_runtime_dependency('bootsnap')
   s.add_runtime_dependency('jaro_winkler', '~> 1.5.1')
   s.add_runtime_dependency('parallel', '~> 1.10')
   s.add_runtime_dependency('parser', '>= 2.6')

In my environment

after

    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master● ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.52s user 0.08s system 95% cpu 0.634 total
    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master● ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.55s user 0.10s system 93% cpu 0.689 total
    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master● ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.58s user 0.08s system 93% cpu 0

before

    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.79s user 0.12s system 95% cpu 0.952 total
    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.75s user 0.06s system 97% cpu 0.832 total
    _╰╰,   /ﾊﾞｼｮ % ~/src/github.com/rubocop-hq/rubocop
  _/o ŏｧ  / ﾌﾞﾗﾝﾁ% master ﾔﾊﾞｲ
∈ミ;ﾉ,ﾉ   ＼ﾒｲﾚｲ% time bundle exec rubocop -v
0.70.0
bundle exec rubocop -v  0.78s user 0.10s system 95% cpu 0.923 tota