diff --git a/bundler/lib/bundler/lazy_specification.rb b/bundler/lib/bundler/lazy_specification.rb
index 198906b987ae..5d92290d9725 100644
--- a/bundler/lib/bundler/lazy_specification.rb
+++ b/bundler/lib/bundler/lazy_specification.rb
@@ -35,7 +35,8 @@ def eql?(other)
     end
 
     def hash
-      identifier.hash
+      # memoize this to help performance when called repeatedly for hash operations
+      @hash ||= identifier.hash
     end
 
     ##