Merge branch '217580-improve-blob-show-performance' into 'master'

Improve BlobController show.json performance: cache method calls

See merge request gitlab-org/gitlab!33876

app/models/project.rb

@@ -675,6 +675,7 @@ class Project < ApplicationRecord
     # '>' or its escaped form ('&gt;') are checked for because '>' is sometimes escaped
     # when the reference comes from an external source.
     def markdown_reference_pattern
+      @markdown_reference_pattern ||=
         %r{
           #{reference_pattern}
           (#{reference_postfix}|#{reference_postfix_escaped})

app/models/user.rb

@@ -619,6 +619,7 @@ class User < ApplicationRecord
 
     # Pattern used to extract `@user` user references from text
     def reference_pattern
+      @reference_pattern ||=
         %r{
           (?<!\w)
           #{Regexp.escape(reference_prefix)}