diff --git a/bin/bson_benchmark.rb b/bin/bson_benchmark.rb
new file mode 100644
index 0000000..840a6ff
--- /dev/null
+++ b/bin/bson_benchmark.rb
@@ -0,0 +1,59 @@
+#!/usr/bin/env ruby
+
+$LOAD_PATH[0,0] = File.join(File.dirname(__FILE__), '..', 'lib')
+require 'mongo'
+
+include XGen::Mongo::Driver
+
+TRIALS = 100000
+
+def encode(doc)
+  t0 = Time.new
+  b = BSON.new
+  TRIALS.times { |i|
+    b = BSON.new
+    b.serialize doc
+  }
+  print "took: #{Time.now.to_f - t0.to_f}\n"
+  return b
+end
+
+def decode(bson)
+  t0 = Time.new
+  doc = nil
+  TRIALS.times { |i|
+    doc = bson.deserialize
+  }
+  print "took: #{Time.now.to_f - t0.to_f}\n"
+  return doc
+end
+
+TEST_CASES = [{},
+              {
+                "hello" => "world"
+              },
+              {
+                "hello" => "world",
+                "mike" => "something",
+                "here's" => "another"
+              },
+              {
+                "int" => 200,
+                "bool" => true,
+                "an int" => 20,
+                "a bool" => false
+              },
+              {
+                "this"=> 5,
+                "is" => {"a" => true},
+                "big" => [true, 5.5],
+                "object" => nil
+              }]
+
+TEST_CASES.each { |doc|
+  print "case #{doc.inspect}\n"
+  print "enc bson\n"
+  enc_bson = encode(doc)
+  print "dec bson\n"
+  raise "FAIL" unless doc == decode(enc_bson)
+}