diff --git a/includes/Title.php b/includes/Title.php
index 21872e45b6b..09c5a3a1d56 100644
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -86,6 +86,7 @@ class Title {
 	var $mRedirect = null;            // /< Is the article at this title a redirect?
 	var $mNotificationTimestamp = array(); // /< Associative array of user ID -> timestamp/false
 	var $mHasSubpage;                 // /< Whether a page has any subpages
+	private $mPageLanguage = false;   // /< The (string) language code of the page's language and content code.
 	// @}
 
 	/**
@@ -3110,6 +3111,7 @@ class Title {
 		$this->mLatestID = false;
 		$this->mContentModel = false;
 		$this->mEstimateRevisions = null;
+		$this->mPageLanguage = false;
 	}
 
 	/**
@@ -4812,18 +4814,26 @@ class Title {
 	 * @return Language
 	 */
 	public function getPageLanguage() {
-		global $wgLang;
+		global $wgLang, $wgLanguageCode;
+		wfProfileIn( __METHOD__ );
 		if ( $this->isSpecialPage() ) {
 			// special pages are in the user language
+			wfProfileOut( __METHOD__ );
 			return $wgLang;
 		}
 
-		//TODO: use the LinkCache to cache this! Note that this may depend on user settings, so the cache should be only per-request.
-		//NOTE: ContentHandler::getPageLanguage() may need to load the content to determine the page language!
-		$contentHandler = ContentHandler::getForTitle( $this );
-		$pageLang = $contentHandler->getPageLanguage( $this );
-
-		return wfGetLangObj( $pageLang );
+		if ( !$this->mPageLanguage || $this->mPageLanguage[1] !== $wgLanguageCode ) {
+			// Note that this may depend on user settings, so the cache should be only per-request.
+			// NOTE: ContentHandler::getPageLanguage() may need to load the content to determine the page language!
+			// Checking $wgLanguageCode hasn't changed for the benefit of unit tests.
+			$contentHandler = ContentHandler::getForTitle( $this );
+			$langObj = wfGetLangObj( $contentHandler->getPageLanguage( $this ) );
+			$this->mPageLanguage = array( $langObj->getCode(), $wgLanguageCode );
+		} else {
+			$langObj =  wfGetLangObj( $this->mPageLanguage[0] );
+		}
+		wfProfileOut( __METHOD__ );
+		return $langObj;
 	}
 
 	/**