diff --git a/benchmarks/rr_benchmark.rb b/benchmarks/rr_benchmark.rb
new file mode 100644
index 00000000..3fa9e1be
--- /dev/null
+++ b/benchmarks/rr_benchmark.rb
@@ -0,0 +1,32 @@
+dir = File.dirname(__FILE__)
+require File.expand_path("#{dir}/../lib/rr")
+require "benchmark"
+
+o = Object.new
+
+Benchmark.bm do |x|
+  x.report do
+    1000.times do
+      RR.mock(o).foobar.returns("baz")
+      o.foobar
+      RR.reset
+    end
+  end
+end
+
+#require "ruby-prof"
+#RubyProf.start
+#
+##RR.mock(o).foobar.returns("baz")
+##o.foobar
+#250.times do
+#  RR.mock(o).foobar.returns("baz")
+#  o.foobar
+#  RR.reset
+#end
+#
+#result = RubyProf.stop
+#
+## Print a flat profile to text
+#printer = RubyProf::FlatPrinter.new(result)
+#printer.print(STDOUT, 0)
\ No newline at end of file
diff --git a/benchmarks/rspec_benchmark.rb b/benchmarks/rspec_benchmark.rb
new file mode 100644
index 00000000..65c54eb3
--- /dev/null
+++ b/benchmarks/rspec_benchmark.rb
@@ -0,0 +1,14 @@
+require "rubygems"
+require "spec/mocks"
+require "benchmark"
+
+o = Object.new
+
+Benchmark.bm do |x|
+  x.report do
+    1000.times do
+      o.should_receive(:foobar).and_return("baz")
+      o.foobar
+    end
+  end
+end
diff --git a/lib/rr/double_definitions/double_definition_creator_proxy.rb b/lib/rr/double_definitions/double_definition_creator_proxy.rb
index d7eb365d..613c1286 100644
--- a/lib/rr/double_definitions/double_definition_creator_proxy.rb
+++ b/lib/rr/double_definitions/double_definition_creator_proxy.rb
@@ -1,6 +1,17 @@
 module RR
   module DoubleDefinitions
     class DoubleDefinitionCreatorProxy
+      class << self
+        def blank_slate_methods
+          instance_methods.each do |m|
+            unless m =~ /^_/ || m.to_s == 'object_id' || m.to_s == "instance_eval" || m.to_s == 'respond_to?'
+              alias_method "__blank_slated_#{m}", m
+              undef_method m
+            end
+          end
+        end
+      end
+
       def initialize(creator, &block) #:nodoc:
         @creator = creator
         class << self
@@ -12,12 +23,7 @@ def __apply_blank_slate?
             @apply_blank_slate ||= false
           end
 
-          instance_methods.each do |m|
-            unless m =~ /^_/ || m.to_s == 'object_id' || m.to_s == "instance_eval" || m.to_s == 'respond_to?'
-              alias_method "__blank_slated_#{m}", m
-              undef_method m
-            end
-          end
+          blank_slate_methods
 
           def instance_eval
             return_value = super
diff --git a/lib/rr/expectations/argument_equality_expectation.rb b/lib/rr/expectations/argument_equality_expectation.rb
index 5fc8a67d..8820c89c 100644
--- a/lib/rr/expectations/argument_equality_expectation.rb
+++ b/lib/rr/expectations/argument_equality_expectation.rb
@@ -8,17 +8,17 @@ def initialize(*expected_arguments)
       end
 
       def exact_match?(*arguments)
-        return false unless arguments.length == @expected_arguments.length
+        return false unless arguments.length == expected_arguments.length
         arguments.each_with_index do |arg, index|
-          return false unless equality_match(@expected_arguments[index], arg)
+          return false unless equality_match(expected_arguments[index], arg)
         end
         true
       end
 
       def wildcard_match?(*arguments)
-        return false unless arguments.length == @expected_arguments.length
+        return false unless arguments.length == expected_arguments.length
         arguments.each_with_index do |arg, index|
-          expected_argument = @expected_arguments[index]
+          expected_argument = expected_arguments[index]
           if expected_argument.respond_to?(:wildcard_match?)
             return false unless expected_argument.wildcard_match?(arg)
           else
@@ -29,7 +29,7 @@ def wildcard_match?(*arguments)
       end
 
       def ==(other)
-        @expected_arguments == other.expected_arguments
+        expected_arguments == other.expected_arguments
       end
 
       protected