[rubygems/rubygems] Fix performance regression in `require`

Our check for `-I` paths should not go through all activated gems.

https://github.com/rubygems/rubygems/commit/00d98eb8a3

1 files changed, 10 insertions, 0 deletions

diff --git a/lib/rubygems.rb b/lib/rubygems.rb
index ef744c40ba..9bf1c63a3e 100644
--- a/lib/rubygems.rb
+++ b/lib/rubygems.rb
@@ -594,9 +594,19 @@ An Array (#{env.inspect}) was passed in from #{caller[3]}
   end
 
   ##
+  # The number of paths in the `$LOAD_PATH` from activated gems. Used to
+  # prioritize `-I` and `ENV['RUBYLIB`]` entries during `require`.
+
+  def self.activated_gem_paths
+    @activated_gem_paths ||= 0
+  end
+
+  ##
   # Add a list of paths to the $LOAD_PATH at the proper place.
 
   def self.add_to_load_path(*paths)
+    @activated_gem_paths = activated_gem_paths + paths.size
+
     insert_index = load_path_insert_index
 
     if insert_index