diff --git a/src/GTMetrixClient.php b/src/GTMetrixClient.php
index 7496e80..005a88d 100644
--- a/src/GTMetrixClient.php
+++ b/src/GTMetrixClient.php
@@ -182,12 +182,13 @@ public function getBrowser($id) {
 	 * @param null|string   $browser
 	 * @param null|string   $httpUser
 	 * @param null|string   $httpPassword
+	 * @param array		$xParams
 	 *
 	 * @return GTMetrixTest
 	 * @throws GTMetrixConfigurationException
 	 * @throws GTMetrixException
 	 */
-	public function startTest($url, $location = null, $browser = null, $httpUser = null, $httpPassword = null) {
+	public function startTest($url, $location = null, $browser = null, $httpUser = null, $httpPassword = null, array $xParams = []) {
 
 		$data = array();
 		$data['url'] = $url;
@@ -203,6 +204,9 @@ public function startTest($url, $location = null, $browser = null, $httpUser = n
 		if ($httpPassword) {
 			$data['login-pass'] = $httpPassword;
 		}
+		if ($xParams) {
+            		$data = array_merge($data, $xParams);
+        	}
 		$result = $this->apiCall('/test', $data);
 
 		$test = new GTMetrixTest();
@@ -242,6 +246,7 @@ public function getTestStatus($test) {
 			$test->setConnectDuration($testStatus['results']['connect_duration']);
 			$test->setBackendDuration($testStatus['results']['backend_duration']);
 			$test->setFirstPaintTime($testStatus['results']['first_paint_time']);
+			$test->setFirstContentfulPaintTime($testStatus['results']['first_contentful_paint_time']);
 			$test->setDomInteractiveTime($testStatus['results']['dom_interactive_time']);
 			$test->setDomContentLoadedTime($testStatus['results']['dom_content_loaded_time']);
 			$test->setDomContentLoadedDuration($testStatus['results']['dom_content_loaded_duration']);
diff --git a/src/GTMetrixTest.php b/src/GTMetrixTest.php
index c22351c..0623b4a 100644
--- a/src/GTMetrixTest.php
+++ b/src/GTMetrixTest.php
@@ -92,6 +92,11 @@ class GTMetrixTest {
      * @var int
      */
     protected $firstPaintTime;
+	
+    /**
+     * @var int
+     */
+    protected $firstContentfulPaintTime;
 
     /**
      * @var int
@@ -359,6 +364,20 @@ public function setFirstPaintTime($firstPaintTime) {
         $this->firstPaintTime = $firstPaintTime;
     }
 
+    /**
+     * @return int
+     */
+    public function getFirstContentfulPaintTime() {
+        return $this->firstContentfulPaintTime;
+    }
+    
+    /**
+     * @param int $firstPaintTime
+     */
+    public function setFirstContentfulPaintTime($firstContentfulPaintTime) {
+        $this->firstContentfulPaintTime = $firstContentfulPaintTime;
+    }
+    
     /**
      * @return int
      */