diff --git a/.gitignore b/.gitignore
index 42bba817..aa6c14f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@ site/_site/
 coverage
 .ruby-version
 .sass-cache
+tmp/stackprof-*
diff --git a/lib/jekyll/collection.rb b/lib/jekyll/collection.rb
index 5fc3994f..33654f45 100644
--- a/lib/jekyll/collection.rb
+++ b/lib/jekyll/collection.rb
@@ -75,7 +75,7 @@ module Jekyll
     # Returns a String containing the directory name where the collection
     #   is stored on the filesystem.
     def relative_directory
-      "_#{label}"
+      @relative_directory ||= "_#{label}"
     end
 
     # The full path to the directory containing the
@@ -83,7 +83,7 @@ module Jekyll
     # Returns a String containing th directory name where the collection
     #   is stored on the filesystem.
     def directory
-      Jekyll.sanitized_path(site.source, relative_directory)
+      @directory ||= Jekyll.sanitized_path(site.source, relative_directory)
     end
 
     # Checks whether the directory "exists" for this collection.
diff --git a/lib/jekyll/converters/markdown.rb b/lib/jekyll/converters/markdown.rb
index 687b0eca..0dcc90a8 100644
--- a/lib/jekyll/converters/markdown.rb
+++ b/lib/jekyll/converters/markdown.rb
@@ -46,9 +46,15 @@ module Jekyll
         ].map(&:to_sym)
       end
 
+      def extname_matches_regexp
+        @extname_matches_regexp ||= Regexp.new(
+          '(' + @config['markdown_ext'].gsub(',','|') +')$',
+          Regexp::IGNORECASE
+        )
+      end
+
       def matches(ext)
-        rgx = '^\.(' + @config['markdown_ext'].gsub(',','|') +')$'
-        ext =~ Regexp.new(rgx, Regexp::IGNORECASE)
+        ext =~ extname_matches_regexp
       end
 
       def output_ext(ext)
diff --git a/lib/jekyll/converters/textile.rb b/lib/jekyll/converters/textile.rb
index 366aa0ce..c8137a3a 100644
--- a/lib/jekyll/converters/textile.rb
+++ b/lib/jekyll/converters/textile.rb
@@ -16,9 +16,15 @@ module Jekyll
         raise Errors::FatalException.new("Missing dependency: RedCloth")
       end
 
+      def extname_matches_regexp
+        @extname_matches_regexp ||= Regexp.new(
+          '(' + @config['textile_ext'].gsub(',','|') +')$',
+          Regexp::IGNORECASE
+        )
+      end
+
       def matches(ext)
-        rgx = '(' + @config['textile_ext'].gsub(',','|') +')'
-        ext =~ Regexp.new(rgx, Regexp::IGNORECASE)
+        ext =~ extname_matches_regexp
       end
 
       def output_ext(ext)
diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index f4761ef8..95a2bdcd 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -4,7 +4,7 @@ module Jekyll
   class Document
     include Comparable
 
-    attr_reader   :path, :site
+    attr_reader   :path, :site, :extname
     attr_accessor :content, :collection, :output
 
     # Create a new Document.
@@ -16,6 +16,7 @@ module Jekyll
     def initialize(path, relations)
       @site = relations[:site]
       @path = path
+      @extname = File.extname(path)
       @collection = relations[:collection]
       @has_yaml_header = nil
     end
@@ -33,23 +34,21 @@ module Jekyll
     # Returns a String path which represents the relative path
     #   from the site source to this document
     def relative_path
-      Pathname.new(path).relative_path_from(Pathname.new(site.source)).to_s
+      @relative_path ||= Pathname.new(path).relative_path_from(Pathname.new(site.source)).to_s
+    end
+
+    # The base filename of the document, without the file extname.
+    #
+    # Returns the basename without the file extname.
+    def basename_without_ext
+      @basename_without_ext ||= File.basename(path, '.*')
     end
 
     # The base filename of the document.
     #
-    # suffix - (optional) the suffix to be removed from the end of the filename
-    #
     # Returns the base filename of the document.
-    def basename(suffix = "")
-      File.basename(path, suffix)
-    end
-
-    # The extension name of the document.
-    #
-    # Returns the extension name of the document.
-    def extname
-      File.extname(path)
+    def basename
+      @basename ||= File.basename(path)
     end
 
     # Produces a "cleaned" relative path.
@@ -64,7 +63,8 @@ module Jekyll
     #
     # Returns the cleaned relative path of the document.
     def cleaned_relative_path
-      relative_path[0 .. -extname.length - 1].sub(collection.relative_directory, "")
+      @cleaned_relative_path ||=
+        relative_path[0 .. -extname.length - 1].sub(collection.relative_directory, "")
     end
 
     # Determine whether the document is a YAML file.
@@ -129,8 +129,8 @@ module Jekyll
         collection: collection.label,
         path:       cleaned_relative_path,
         output_ext: Jekyll::Renderer.new(site, self).output_ext,
-        name:       Utils.slugify(basename(".*")),
-        title:      Utils.slugify(data['title']) || Utils.slugify(basename(".*"))
+        name:       Utils.slugify(basename_without_ext),
+        title:      Utils.slugify(data['title']) || Utils.slugify(basename_without_ext)
       }
     end
 
diff --git a/lib/jekyll/tags/include.rb b/lib/jekyll/tags/include.rb
index 87583e95..c6b1ed9c 100644
--- a/lib/jekyll/tags/include.rb
+++ b/lib/jekyll/tags/include.rb
@@ -13,11 +13,14 @@ module Jekyll
 
     class IncludeTag < Liquid::Tag
 
+      attr_reader :includes_dir
+
       VALID_SYNTAX = /([\w-]+)\s*=\s*(?:"([^"\\]*(?:\\.[^"\\]*)*)"|'([^'\\]*(?:\\.[^'\\]*)*)'|([\w\.-]+))/
       VARIABLE_SYNTAX = /(?<variable>[^{]*\{\{\s*(?<name>[\w\-\.]+)\s*(\|.*)?\}\}[^\s}]*)(?<params>.*)/
 
       def initialize(tag_name, markup, tokens)
         super
+        @includes_dir = tag_includes_dir
         matched = markup.strip.match(VARIABLE_SYNTAX)
         if matched
           @file = matched['variable'].strip
@@ -97,7 +100,7 @@ eos
         end
       end
 
-      def includes_dir
+      def tag_includes_dir
         '_includes'
       end
 
@@ -118,12 +121,12 @@ eos
             partial.render!(context)
           end
         rescue => e
-          raise IncludeTagError.new e.message, File.join(includes_dir, @file)
+          raise IncludeTagError.new e.message, File.join(@includes_dir, @file)
         end
       end
 
       def resolved_includes_dir(context)
-        File.join(File.realpath(context.registers[:site].source), includes_dir)
+        File.join(File.realpath(context.registers[:site].source), @includes_dir)
       end
 
       def validate_path(path, dir, safe)
@@ -135,7 +138,7 @@ eos
       end
 
       def path_relative_to_source(dir, path)
-        File.join(includes_dir, path.sub(Regexp.new("^#{dir}"), ""))
+        File.join(@includes_dir, path.sub(Regexp.new("^#{dir}"), ""))
       end
 
       def realpath_prefixed_with?(path, dir)
@@ -149,13 +152,16 @@ eos
     end
 
     class IncludeRelativeTag < IncludeTag
-      def includes_dir
+      def tag_includes_dir
         '.'
       end
 
+      def page_path(context)
+        context.registers[:page].nil? ? includes_dir : File.dirname(context.registers[:page]["path"])
+      end
+
       def resolved_includes_dir(context)
-        page_path = context.registers[:page].nil? ? includes_dir : File.dirname(context.registers[:page]["path"])
-        Jekyll.sanitized_path(context.registers[:site].source, page_path)
+        Jekyll.sanitized_path(context.registers[:site].source, page_path(context))
       end
     end
   end
diff --git a/script/stackprof b/script/stackprof
index 32c89ac3..e0e2d4db 100755
--- a/script/stackprof
+++ b/script/stackprof
@@ -3,11 +3,14 @@
 set -e
 
 export BENCHMARK=true
-script/bootstrap
+command -v stackprof > /dev/null || script/bootstrap
 
 TEST_SCRIPT="Jekyll::Commands::Build.process({'source' => 'site'})"
 PROF_OUTPUT_FILE=tmp/stackprof-$(date +%Y%m%d).dump
 
-bundle exec ruby -r./lib/jekyll -rstackprof -e "StackProf.run(mode: :cpu, out: '${PROF_OUTPUT_FILE}') { ${TEST_SCRIPT} }"
+test -f "$PROF_OUTPUT_FILE" || {
+  bundle exec ruby -r./lib/jekyll -rstackprof \
+    -e "StackProf.run(mode: :cpu, out: '${PROF_OUTPUT_FILE}') { ${TEST_SCRIPT} }"
+}
 
 bundle exec stackprof $PROF_OUTPUT_FILE $@
diff --git a/test/test_document.rb b/test/test_document.rb
index 5e26173f..3464cd2b 100644
--- a/test/test_document.rb
+++ b/test/test_document.rb
@@ -25,8 +25,8 @@ class TestDocument < Test::Unit::TestCase
       assert_equal "configuration.md", @document.basename
     end
 
-    should "allow the suffix to be specified for the basename" do
-      assert_equal "configuration", @document.basename(".*")
+    should "know its basename without extname" do
+      assert_equal "configuration", @document.basename_without_ext
     end
 
     should "know whether its a yaml file" do