diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index bf4cead4..067648b7 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -14,9 +14,9 @@ module Jekyll
     #
     # Returns the HTML formatted String.
     def markdownify(input)
-      site = @context.registers[:site]
-      converter = site.find_converter_instance(Jekyll::Converters::Markdown)
-      converter.convert(input.to_s)
+      @context.registers[:site].find_converter_instance(
+        Jekyll::Converters::Markdown
+      ).convert(input.to_s)
     end
 
     # Convert quotes into smart quotes.
@@ -25,9 +25,9 @@ module Jekyll
     #
     # Returns the smart-quotified String.
     def smartify(input)
-      site = @context.registers[:site]
-      converter = site.find_converter_instance(Jekyll::Converters::SmartyPants)
-      converter.convert(input.to_s)
+      @context.registers[:site].find_converter_instance(
+        Jekyll::Converters::SmartyPants
+      ).convert(input.to_s)
     end
 
     # Convert a Sass string into CSS output.
@@ -36,9 +36,9 @@ module Jekyll
     #
     # Returns the CSS formatted String.
     def sassify(input)
-      site = @context.registers[:site]
-      converter = site.find_converter_instance(Jekyll::Converters::Sass)
-      converter.convert(input)
+      @context.registers[:site].find_converter_instance(
+        Jekyll::Converters::Sass
+      ).convert(input)
     end
 
     # Convert a Scss string into CSS output.
@@ -47,9 +47,9 @@ module Jekyll
     #
     # Returns the CSS formatted String.
     def scssify(input)
-      site = @context.registers[:site]
-      converter = site.find_converter_instance(Jekyll::Converters::Scss)
-      converter.convert(input)
+      @context.registers[:site].find_converter_instance(
+        Jekyll::Converters::Scss
+      ).convert(input)
     end
 
     # Slugify a filename or title.
diff --git a/lib/jekyll/site.rb b/lib/jekyll/site.rb
index e74251af..25257a64 100644
--- a/lib/jekyll/site.rb
+++ b/lib/jekyll/site.rb
@@ -277,10 +277,12 @@ module Jekyll
     # Get the implementation class for the given Converter.
     # Returns the Converter instance implementing the given Converter.
     # klass - The Class of the Converter to fetch.
-
     def find_converter_instance(klass)
-      converters.find { |klass_| klass_.instance_of?(klass) } || \
-        raise("No Converters found for #{klass}")
+      @find_converter_instance ||= {}
+      @find_converter_instance[klass] ||= begin
+        converters.find { |converter| converter.instance_of?(klass) } || \
+          raise("No Converters found for #{klass}")
+      end
     end
 
     # klass - class or module containing the subclasses.