public function enableTicks(int $tickFreq = null) {

        if (is_null($tickFreq)) {
            $tickFreq = self::$tickFreq;
        }

        // Change ticking frequency
        self::$tickFreq = $tickFreq;
        self::$lastTick = microtime(true);

        // If we're already ticking, don't register again
        if (self::$ticking) {
            return true;
        }

        register_tick_function(['\Kaecyra\AppCommon\Event', 'tick']);
    }