I see what's going on now, in 9.16.0, I introduced the RegEx class which is making use of preg_match_all instead of preg_match that 9.15 was using.

This code sample below takes 0.09 seconds with v9.15.10.0 and 40 seconds with v9.18.1.4.

<?php
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }

    abstract function test();
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;
require_once 'Zend/Uri/Http.php';

namespace Location\Web;

interface Factory
{
    static function _factory();
}

abstract class URI extends BaseURI implements Factory
{
    const ME = "Yo";

    public static $st1 = 1;

    var $list = NULL;

    private $var;

    abstract function test();

    /**
     * Returns a URI
     *
     * @return URI
     */
    static public function _factory($stats = array(), $uri = 'http')
    {
        echo __METHOD__;
        $uri = explode(':', $uri, 0b10);
        $schemeSpecific = isset($uri[1]) ? $uri[1] : '';
        $desc = 'Multi
line description';
        // Security check
        if (!ctype_alnum($scheme)) {
            throw new Zend_Uri_Exception('Illegal scheme');
        }
        $this->var = 0 - self::$st;
        $this->list = list(array("1" => 2, 2 => self::ME, 3 => \Location\Web\URI::class));

        return [
            'uri' => $uri,
            'value' => null,
        ];
    }
}

echo URI::ME . URI::$st1;

Uh oh!

Performance issue #78

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