diff --git a/dev/tools/test/testperf.php b/dev/tools/test/testperf.php
new file mode 100755
index 00000000000..9b0b9f2bf81
--- /dev/null
+++ b/dev/tools/test/testperf.php
@@ -0,0 +1,22 @@
+<?php
+
+$a = microtime(true);
+
+$i = 0;
+while ($i < 1000000)
+{
+	$key = '1234567890111213141516171819'.$i;
+	if ($i == 1000) $key = 'MAIN_MODULE_AAAAAiiiiiiiiiiiiiiiiiiiiiiiiiiiii';
+
+	//if (preg_match('/^MAIN_MODULE_/', $key)) {
+	if (strpos($key, 'MAIN_MODULE_') === 0) {
+	//if (substr($key, 0, 12) == 'MAIN_MODULE_') {
+		print "Found\n";
+	}
+	$i++;
+}
+
+$b = microtime(true);
+
+print $b - $a."\n";
+