diff --git a/hphp/test/ext/test_ext.h b/hphp/test/ext/test_ext.h
index caff1ce20..4b305ab60 100644
--- a/hphp/test/ext/test_ext.h
+++ b/hphp/test/ext/test_ext.h
@@ -34,7 +34,6 @@
 #include "hphp/facebook/extensions/string_buffer/test_ext_string_buffer.h"
 #include "hphp/facebook/extensions/tao/test_ext_tao.h"
 #include "hphp/facebook/extensions/urlextraction/test_ext_urlextraction.h"
-#include "hphp/test/ext/test_ext_bzip2.h"
 #include "hphp/test/ext/test_ext_curl.h"
 #include "hphp/test/ext/test_ext_file.h"
 #include "hphp/test/ext/test_ext_hash.h"
diff --git a/hphp/test/ext/test_ext_bzip2.cpp b/hphp/test/ext/test_ext_bzip2.cpp
deleted file mode 100644
index c779f2392..000000000
--- a/hphp/test/ext/test_ext_bzip2.cpp
+++ /dev/null
@@ -1,133 +0,0 @@
-/*
-   +----------------------------------------------------------------------+
-   | HipHop for PHP                                                       |
-   +----------------------------------------------------------------------+
-   | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
-   +----------------------------------------------------------------------+
-   | This source file is subject to version 3.01 of the PHP license,      |
-   | that is bundled with this package in the file LICENSE, and is        |
-   | available through the world-wide-web at the following url:           |
-   | http://www.php.net/license/3_01.txt                                  |
-   | If you did not receive a copy of the PHP license and are unable to   |
-   | obtain it through the world-wide-web, please send a note to          |
-   | license@php.net so we can mail you a copy immediately.               |
-   +----------------------------------------------------------------------+
-*/
-
-#include "hphp/test/ext/test_ext_bzip2.h"
-#include "hphp/runtime/ext/ext_bzip2.h"
-
-IMPLEMENT_SEP_EXTENSION_TEST(Bzip2);
-///////////////////////////////////////////////////////////////////////////////
-
-bool TestExtBzip2::RunTests(const std::string &which) {
-  bool ret = true;
-
-  RUN_TEST(test_bzclose);
-  RUN_TEST(test_bzopen);
-  RUN_TEST(test_bzread);
-  RUN_TEST(test_bzwrite);
-  RUN_TEST(test_bzflush);
-  RUN_TEST(test_bzerrstr);
-  RUN_TEST(test_bzerror);
-  RUN_TEST(test_bzerrno);
-  RUN_TEST(test_bzcompress);
-  RUN_TEST(test_bzdecompress);
-
-  return ret;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-bool TestExtBzip2::test_bzclose() {
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzopen() {
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzread() {
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzwrite() {
-  String str = "HipHop for";
-  Variant bz = f_bzopen("test/test_ext_bzip2.tmp", "w");
-  VERIFY(bz);
-  VS(f_bzwrite(bz, str), 10);
-  f_bzflush(bz);
-  VERIFY(f_bzclose(bz));
-
-  bz = f_bzopen("test/test_ext_bzip2.tmp", "r");
-  Variant ret = f_bzread(bz, 10000);
-  VS(ret, str);
-  VERIFY(f_bzclose(bz));
-  VS(ret, str);
-  f_unlink("test/test_ext_bzip2.tmp");
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzflush() {
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzerrstr() {
-  Variant f = f_fopen("test/test_ext_bzip2.tmp", "w");
-  f_fwrite(f, "this is a test");
-  f_fclose(f);
-  f = f_bzopen("test/test_ext_bzip2.tmp", "r");
-  f_bzread(f);
-  String ret = f_bzerrstr(f);
-  f_bzclose(f);
-  f_unlink("test/test_ext_bzip2.tmp");
-  VS(ret, "DATA_ERROR_MAGIC");
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzerror() {
-  Variant f = f_fopen("test/test_ext_bzip2.tmp", "w");
-  f_fwrite(f, "this is a test");
-  f_fclose(f);
-  f = f_bzopen("test/test_ext_bzip2.tmp", "r");
-  f_bzread(f);
-  Variant ret = f_bzerror(f);
-  f_bzclose(f);
-  f_unlink("test/test_ext_bzip2.tmp");
-  VS(ret, CREATE_MAP2("errno", -5, "errstr", "DATA_ERROR_MAGIC"));
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzerrno() {
-  Variant f = f_fopen("test/test_ext_bzip2.tmp", "w");
-  f_fwrite(f, "this is a test");
-  f_fclose(f);
-  f = f_bzopen("test/test_ext_bzip2.tmp", "r");
-  f_bzread(f);
-  int ret = f_bzerrno(f);
-  f_bzclose(f);
-  f_unlink("test/test_ext_bzip2.tmp");
-  VS(ret, -5);
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzcompress() {
-  return Count(true);
-}
-
-bool TestExtBzip2::test_bzdecompress() {
-  String str = "HipHop for PHP transforms PHP source code into highly optimized C++.";
-  String ret;
-  ret = f_bzcompress(str);
-  ret = f_bzcompress(ret);
-  ret = f_bzcompress(ret);
-  ret = f_bzdecompress(ret);
-  ret = f_bzdecompress(ret);
-  ret = f_bzdecompress(ret);
-  VS(ret, str);
-  str = StringUtil::Repeat("x", 1000);
-  ret = f_bzcompress(str);
-  ret = f_bzdecompress(ret);
-  VS(ret, str);
-  return Count(true);
-}
diff --git a/hphp/test/ext/test_ext_bzip2.h b/hphp/test/ext/test_ext_bzip2.h
deleted file mode 100644
index 07e2917f1..000000000
--- a/hphp/test/ext/test_ext_bzip2.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
-   +----------------------------------------------------------------------+
-   | HipHop for PHP                                                       |
-   +----------------------------------------------------------------------+
-   | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
-   +----------------------------------------------------------------------+
-   | This source file is subject to version 3.01 of the PHP license,      |
-   | that is bundled with this package in the file LICENSE, and is        |
-   | available through the world-wide-web at the following url:           |
-   | http://www.php.net/license/3_01.txt                                  |
-   | If you did not receive a copy of the PHP license and are unable to   |
-   | obtain it through the world-wide-web, please send a note to          |
-   | license@php.net so we can mail you a copy immediately.               |
-   +----------------------------------------------------------------------+
-*/
-
-#ifndef incl_HPHP_TEST_EXT_BZIP2_H_
-#define incl_HPHP_TEST_EXT_BZIP2_H_
-
-// >>>>>> Generated by idl.php. Do NOT modify. <<<<<<
-
-#include "hphp/test/ext/test_cpp_ext.h"
-
-///////////////////////////////////////////////////////////////////////////////
-
-class TestExtBzip2 : public TestCppExt {
- public:
-  virtual bool RunTests(const std::string &which);
-
-  bool test_bzclose();
-  bool test_bzopen();
-  bool test_bzread();
-  bool test_bzwrite();
-  bool test_bzflush();
-  bool test_bzerrstr();
-  bool test_bzerror();
-  bool test_bzerrno();
-  bool test_bzcompress();
-  bool test_bzdecompress();
-};
-
-///////////////////////////////////////////////////////////////////////////////
-
-#endif // incl_HPHP_TEST_EXT_BZIP2_H_
diff --git a/hphp/test/slow/ext_bzip2/bzcompress.php b/hphp/test/slow/ext_bzip2/bzcompress.php
new file mode 100644
index 000000000..d7f4bd3a4
--- /dev/null
+++ b/hphp/test/slow/ext_bzip2/bzcompress.php
@@ -0,0 +1,15 @@
+<?php
+
+$str = "Holy fuck. Are they actually going to get there?";
+
+$ret = bzcompress($str);
+$ret = bzcompress($ret);
+$ret = bzcompress($ret);
+$ret = bzdecompress($ret);
+$ret = bzdecompress($ret);
+$ret = bzdecompress($ret);
+var_dump($ret === $str);
+$str = str_repeat("x", 1000);
+$ret = bzcompress($str);
+$ret = bzdecompress($ret);
+var_dump($ret === $str);
diff --git a/hphp/test/slow/ext_bzip2/bzcompress.php.expect b/hphp/test/slow/ext_bzip2/bzcompress.php.expect
new file mode 100644
index 000000000..053a4cc7b
--- /dev/null
+++ b/hphp/test/slow/ext_bzip2/bzcompress.php.expect
@@ -0,0 +1,2 @@
+bool(true)
+bool(true)
diff --git a/hphp/test/slow/ext_bzip2/ext_bzip2.php b/hphp/test/slow/ext_bzip2/ext_bzip2.php
new file mode 100644
index 000000000..e2cf8c9d6
--- /dev/null
+++ b/hphp/test/slow/ext_bzip2/ext_bzip2.php
@@ -0,0 +1,60 @@
+<?php
+
+function VS($x, $y) {
+  var_dump($x === $y);
+  if ($x !== $y) { echo "Failed: $y\n"; }
+}
+function VERIFY($x) { VS($x, true); }
+
+$tmpfile = tempnam('/tmp', 'hhbztest.tmp');
+
+function test_bzwrite() {
+  global $tmpfile;
+
+  $str = "HipHop for";
+  $bz = bzopen($tmpfile, "w");
+  VERIFY($bz !== false);
+  VS(bzwrite($bz, $str), 10);
+  bzflush($bz);
+  VERIFY(bzclose($bz));
+
+  $bz = bzopen($tmpfile, "r");
+  $ret = bzread($bz, 10000);
+  VS($ret, $str);
+  VERIFY(bzclose($bz));
+  VS($ret, $str);
+  unlink($tmpfile);
+}
+
+function test_bzerrstr() {
+  global $tmpfile;
+
+  $f = fopen($tmpfile, "w");
+  fwrite($f, "this is a test");
+  fclose($f);
+  $f = bzopen($tmpfile, "r");
+  bzread($f);
+  $ret = bzerrstr($f);
+  bzclose($f);
+  unlink($tmpfile);
+  VS($ret, "DATA_ERROR_MAGIC");
+}
+
+function test_bzerror() {
+  global $tmpfile;
+
+  $f = fopen($tmpfile, "w");
+  fwrite($f, "this is a test");
+  fclose($f);
+  $f = bzopen($tmpfile, "r");
+  bzread($f);
+  $ret = bzerror($f);
+  bzclose($f);
+  unlink($tmpfile);
+  VS($ret, array("errno" => -5,
+                 "errstr" => "DATA_ERROR_MAGIC"));
+}
+
+test_bzwrite();
+test_bzerrstr();
+test_bzerror();
diff --git a/hphp/test/slow/ext_bzip2/ext_bzip2.php.expect b/hphp/test/slow/ext_bzip2/ext_bzip2.php.expect
new file mode 100644
index 000000000..859686428
--- /dev/null
+++ b/hphp/test/slow/ext_bzip2/ext_bzip2.php.expect
@@ -0,0 +1,8 @@
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)