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

@@ -675,10 +675,11 @@ 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
-      %r{
-        #{reference_pattern}
-        (#{reference_postfix}|#{reference_postfix_escaped})
-      }x
+      @markdown_reference_pattern ||=
+        %r{
+          #{reference_pattern}
+          (#{reference_postfix}|#{reference_postfix_escaped})
+        }x
     end
 
     def trending

app/models/user.rb

@@ -619,11 +619,12 @@ class User < ApplicationRecord
 
     # Pattern used to extract `@user` user references from text
     def reference_pattern
-      %r{
-        (?<!\w)
-        #{Regexp.escape(reference_prefix)}
-        (?<user>#{Gitlab::PathRegex::FULL_NAMESPACE_FORMAT_REGEX})
-      }x
+      @reference_pattern ||=
+        %r{
+          (?<!\w)
+          #{Regexp.escape(reference_prefix)}
+          (?<user>#{Gitlab::PathRegex::FULL_NAMESPACE_FORMAT_REGEX})
+        }x
     end
 
     # Return (create if necessary) the ghost user. The ghost user