diff --git a/tests/memory_limit.phpt b/tests/memory_limit.phpt
index 20e2b31..33621ad 100644
--- a/tests/memory_limit.phpt
+++ b/tests/memory_limit.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::executeString() : Memory limit
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 $JS = <<< EOT
diff --git a/tests/set_memory_limit_001.phpt b/tests/set_memory_limit_001.phpt
index e9ea378..b20b753 100644
--- a/tests/set_memory_limit_001.phpt
+++ b/tests/set_memory_limit_001.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setMemoryLimit() : Memory limit applied to V8Function calls
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_memory_limit_003.phpt b/tests/set_memory_limit_003.phpt
index 17cf3d0..179dfe2 100644
--- a/tests/set_memory_limit_003.phpt
+++ b/tests/set_memory_limit_003.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setMemoryLimit() : Memory limit can be imposed later
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_memory_limit_basic.phpt b/tests/set_memory_limit_basic.phpt
index aa78afa..8546d8f 100644
--- a/tests/set_memory_limit_basic.phpt
+++ b/tests/set_memory_limit_basic.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setMemoryLimit() : Memory limit can be set on V8Js object
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 $JS = <<< EOT
diff --git a/tests/set_time_limit_001.phpt b/tests/set_time_limit_001.phpt
index f134f02..f937a77 100644
--- a/tests/set_time_limit_001.phpt
+++ b/tests/set_time_limit_001.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setTimeLimit() : Time limit applied to V8Function calls
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_time_limit_002.phpt b/tests/set_time_limit_002.phpt
index 76abf7a..81bffcc 100644
--- a/tests/set_time_limit_002.phpt
+++ b/tests/set_time_limit_002.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setTimeLimit() : Time limit can be changed
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_time_limit_003.phpt b/tests/set_time_limit_003.phpt
index d226106..5c2a924 100644
--- a/tests/set_time_limit_003.phpt
+++ b/tests/set_time_limit_003.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setTimeLimit() : Time limit can be imposed later on
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_time_limit_004.phpt b/tests/set_time_limit_004.phpt
index 535f6b3..f3e5d8d 100644
--- a/tests/set_time_limit_004.phpt
+++ b/tests/set_time_limit_004.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setTimeLimit() : Time limit can be prolonged
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/set_time_limit_basic.phpt b/tests/set_time_limit_basic.phpt
index 8e825ee..1af2517 100644
--- a/tests/set_time_limit_basic.phpt
+++ b/tests/set_time_limit_basic.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::setTimeLimit() : Time limit can be set on V8Js object
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php
 
diff --git a/tests/time_limit.phpt b/tests/time_limit.phpt
index 197d7d5..4cef93f 100644
--- a/tests/time_limit.phpt
+++ b/tests/time_limit.phpt
@@ -1,7 +1,13 @@
 --TEST--
 Test V8::executeString() : Time limit
 --SKIPIF--
-<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+
+if (getenv("SKIP_SLOW_TESTS")) {
+	die("skip slow test");
+}
+?>
 --FILE--
 <?php