diff --git a/lib/liquid/block.rb b/lib/liquid/block.rb
index 2d4e293..10df350 100644
--- a/lib/liquid/block.rb
+++ b/lib/liquid/block.rb
@@ -1,6 +1,10 @@
 module Liquid
 
   class Block < Tag
+    IsTag             = /^#{TagStart}/
+    IsVariable        = /^#{VariableStart}/
+    FullToken         = /^#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}$/
+    ContentOfVariable = /^#{VariableStart}(.*)#{VariableEnd}$/
 
     def parse(tokens)
       @nodelist ||= []
@@ -9,8 +13,8 @@ module Liquid
       while token = tokens.shift
 
         case token
-        when /^#{TagStart}/
-          if token =~ /^#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}$/
+        when IsTag
+          if token =~ FullToken
 
             # if we found the proper block delimitor just end parsing here and let the outer block
             # proceed
@@ -30,7 +34,7 @@ module Liquid
           else
             raise SyntaxError, "Tag '#{token}' was not properly terminated with regexp: #{TagEnd.inspect} "
           end
-        when /^#{VariableStart}/
+        when IsVariable
           @nodelist << create_variable(token)
         when ''
           # pass
@@ -68,7 +72,7 @@ module Liquid
     end
 
     def create_variable(token)
-      token.scan(/^#{VariableStart}(.*)#{VariableEnd}$/) do |content|
+      token.scan(ContentOfVariable) do |content|
         return Variable.new(content.first)
       end
       raise SyntaxError.new("Variable '#{token}' was not properly terminated with regexp: #{VariableEnd.inspect} ")
diff --git a/performance/shopify.rb b/performance/shopify.rb
index bd1f634..d4055a9 100644
--- a/performance/shopify.rb
+++ b/performance/shopify.rb
@@ -81,7 +81,7 @@ end
   puts 'Success'
   puts
 
-[RubyProf::FlatPrinter, RubyProf::GraphPrinter, RubyProf::GraphHtmlPrinter].each do |klass|
+[RubyProf::FlatPrinter, RubyProf::GraphPrinter, RubyProf::GraphHtmlPrinter, RubyProf::CallTreePrinter].each do |klass|
   filename = (ENV['TMP'] || '/tmp') + (klass.name.include?('Html') ? "/liquid.#{klass.name.downcase}.html" : "/liquid.#{klass.name.downcase}.txt")
   filename.gsub!(/:+/, '_')
   File.open(filename, "w+") { |fp| klass.new(results).print(fp) }