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diff --git a/vendor/rails/actionpack/lib/action_controller/routing/optimisations.rb b/vendor/rails/actionpack/lib/action_controller/routing/optimisations.rb
new file mode 100644
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--- /dev/null
+++ b/vendor/rails/actionpack/lib/action_controller/routing/optimisations.rb
@@ -0,0 +1,130 @@
+module ActionController
+  module Routing
+    # Much of the slow performance from routes comes from the
+    # complexity of expiry, <tt>:requirements</tt> matching, defaults providing
+    # and figuring out which url pattern to use.  With named routes
+    # we can avoid the expense of finding the right route.  So if
+    # they've provided the right number of arguments, and have no
+    # <tt>:requirements</tt>, we can just build up a string and return it.
+    #
+    # To support building optimisations for other common cases, the
+    # generation code is separated into several classes
+    module Optimisation
+      def generate_optimisation_block(route, kind)
+        return "" unless route.optimise?
+        OPTIMISERS.inject("") do |memo, klazz|
+          memo << klazz.new(route, kind).source_code
+          memo
+        end
+      end
+
+      class Optimiser
+        attr_reader :route, :kind
+        GLOBAL_GUARD_CONDITIONS = [
+          "(!defined?(default_url_options) || default_url_options.blank?)",
+          "(!defined?(controller.default_url_options) || controller.default_url_options.blank?)",
+          "defined?(request)",
+          "request"
+          ]
+
+        def initialize(route, kind)
+          @route = route
+          @kind  = kind
+        end
+
+        def guard_conditions
+          ["false"]
+        end
+
+        def generation_code
+          'nil'
+        end
+
+        def source_code
+          if applicable?
+            guard_condition = (GLOBAL_GUARD_CONDITIONS + guard_conditions).join(" && ")
+            "return #{generation_code} if #{guard_condition}\n"
+          else
+            "\n"
+          end
+        end
+
+        # Temporarily disabled <tt>:url</tt> optimisation pending proper solution to
+        # Issues around request.host etc.
+        def applicable?
+          true
+        end
+      end
+
+      # Given a route
+      #
+      #   map.person '/people/:id'
+      #
+      # If the user calls <tt>person_url(@person)</tt>, we can simply
+      # return a string like "/people/#{@person.to_param}"
+      # rather than triggering the expensive logic in +url_for+.
+      class PositionalArguments < Optimiser
+        def guard_conditions
+          number_of_arguments = route.segment_keys.size
+          # if they're using foo_url(:id=>2) it's one
+          # argument, but we don't want to generate /foos/id2
+          if number_of_arguments == 1
+            ["args.size == 1", "!args.first.is_a?(Hash)"]
+          else
+            ["args.size == #{number_of_arguments}"]
+          end
+        end
+
+        def generation_code
+          elements = []
+          idx = 0
+
+          if kind == :url
+            elements << '#{request.protocol}'
+            elements << '#{request.host_with_port}'
+          end
+
+          elements << '#{ActionController::Base.relative_url_root if ActionController::Base.relative_url_root}'
+
+          # The last entry in <tt>route.segments</tt> appears to *always* be a
+          # 'divider segment' for '/' but we have assertions to ensure that
+          # we don't include the trailing slashes, so skip them.
+          (route.segments.size == 1 ? route.segments : route.segments[0..-2]).each do |segment|
+            if segment.is_a?(DynamicSegment)
+              elements << segment.interpolation_chunk("args[#{idx}].to_param")
+              idx += 1
+            else
+              elements << segment.interpolation_chunk
+            end
+          end
+          %("#{elements * ''}")
+        end
+      end
+
+      # This case is mostly the same as the positional arguments case
+      # above, but it supports additional query parameters as the last
+      # argument
+      class PositionalArgumentsWithAdditionalParams < PositionalArguments
+        def guard_conditions
+          ["args.size == #{route.segment_keys.size + 1}"] +
+          UrlRewriter::RESERVED_OPTIONS.collect{ |key| "!args.last.has_key?(:#{key})" }
+        end
+
+        # This case uses almost the same code as positional arguments,
+        # but add a question mark and args.last.to_query on the end,
+        # unless the last arg is empty
+        def generation_code
+          super.insert(-2, '#{\'?\' + args.last.to_query unless args.last.empty?}')
+        end
+
+        # To avoid generating "http://localhost/?host=foo.example.com" we
+        # can't use this optimisation on routes without any segments
+        def applicable?
+          super && route.segment_keys.size > 0
+        end
+      end
+
+      OPTIMISERS = [PositionalArguments, PositionalArgumentsWithAdditionalParams]
+    end
+  end
+end