diff --git a/bench/perf.rb b/bench/perf.rb
index af545cd8..ea668d56 100644
--- a/bench/perf.rb
+++ b/bench/perf.rb
@@ -31,14 +31,6 @@ end
 u = User.new(1, "sam", 10, "about")
 s = UserSerializer.new(u)
 
-u2 = User.new(2, "sam", 20, "about")
-s2 = UserSerializer.new(u2)
-
-p s2.attributes
-
-p s.attributes
-
-
 n = 100000
 
 Benchmark.bmbm {|x| 
@@ -46,7 +38,6 @@ Benchmark.bmbm {|x|
   x.report("fast_hash") { n.times { u.fast_hash } }
   x.report("attributes") { n.times { UserSerializer.new(u).attributes } } 
   x.report("serializable_hash") { n.times { UserSerializer.new(u).serializable_hash } }
-  x.report("serializable_hash_with_instrumentation") { n.times { UserSerializer.new(u).serializable_hash_with_instrumentation } }
 }   
 
 
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 8ce64135..f1fbae2a 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -284,37 +284,13 @@ module ActiveModel
 
     # Returns a hash representation of the serializable
     # object without the root.
-    def serializable_hash_without_instrumentation
+    def serializable_hash
       return nil if @object.nil?
       @node = attributes
       include_associations! if _embed
       @node
     end
 
-
-    def serializable_hash_with_instrumentation
-      return nil if @object.nil?
-      instrument(:serialize, :serializer => self.class.name) do
-        @node = attributes
-        instrument :associations do
-          include_associations! if _embed
-        end
-        @node
-      end
-    end
-
-    # disable all instrumentation on serializable_hash (performance will be better)
-    def self.disable_instrumentation!
-      alias_method :serializable_hash, :serializable_hash_without_instrumentation
-    end
-
-    # enable instrumentation for serializable_hash (performance may be impacted)
-    def self.enable_instrumentation!
-      alias_method :serializable_hash, :serializable_hash_with_instrumentation
-    end
-
-    disable_instrumentation!
-
     def include_associations!
       _associations.each_key do |name|
         include!(name) if include?(name)