diff -ru ../../typo3/typo3_src-4.4.5/typo3/sysext/cms/tslib/class.tslib_content.php typo3_src/typo3/sysext/cms/tslib/class.tslib_content.php
--- ../../typo3/typo3_src-4.4.5/typo3/sysext/cms/tslib/class.tslib_content.php	2010-12-16 15:10:53.000000000 +0100
+++ typo3_src/typo3/sysext/cms/tslib/class.tslib_content.php	2011-01-13 15:36:57.000000000 +0100
@@ -6128,25 +6128,48 @@
 							foreach ($targetPageRootline as $data)	{
 								$targetPageRootlinePids[] = intval($data['uid']);
 							}
-							$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
-								'pid, domainName, forced',
-								'sys_domain',
-								'pid IN (' . implode(',', $targetPageRootlinePids) . ') ' .
-									' AND redirectTo=\'\' ' . $this->enableFields('sys_domain'),
-								'',
-								'sorting ASC'
-							);
-							// TODO maybe it makes sense to hold all sys_domain records in a cache to save additional DB querys on each typolink
-							while ($row = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {
-								$foundDomains[] = preg_replace('/\/$/', '', $row['domainName']);
-								if (!isset($firstFoundDomains[$row['pid']])) {
-									$firstFoundDomains[$row['pid']] = preg_replace('/\/$/', '', $row['domainName']);
+							
+							if ($GLOBALS['TYPO3_CONF_VARS']['SYS']['useCachingFramework']) {
+								try {
+									$cache = $GLOBALS['typo3CacheManager']->getCache('cacheTypolinkCheckRootline');
+								} catch (t3lib_cache_exception_NoSuchCache $e) { 
+									$cache = $GLOBALS['typo3CacheFactory']->create(
+										'cacheTypolinkCheckRootline',
+										't3lib_cache_frontend_VariableFrontend',
+										't3lib_cache_backend_TransientMemoryBackend'
+									);
+								}
+							}
+							
+							if (is_object($cache) && $cache->has('domainRecords')) {
+								$domainRecords = $cache->get('domainRecords');
+							}
+							
+							if (! isset($domainRecords)) {
+								$domainRecords = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows(
+									'pid, domainName, forced',
+									'sys_domain',
+									/*'pid IN (' . implode(',', $targetPageRootlinePids) . ') ' .*/
+										' redirectTo=\'\' ' . $this->enableFields('sys_domain'),
+									'',
+									'sorting ASC'
+								);
+								if (is_object($cache)) {
+									$cache->set('domainRecords', $domainRecords);
 								}
-								if ($row['forced'] && !isset($firstFoundForcedDomains[$row['pid']])) {
-									$firstFoundForcedDomains[$row['pid']] = preg_replace('/\/$/', '', $row['domainName']);
+							}
+							
+							foreach($domainRecords as $domainRecord) {
+								if (in_array($domainRecord['pid'], $targetPageRootline)) {
+									$foundDomains[] = preg_replace('/\/$/', '', $domainRecord['domainName']);
+									if (!isset($firstFoundDomains[$domainRecord['pid']])) {
+										$firstFoundDomains[$domainRecord['pid']] = preg_replace('/\/$/', '', $domainRecord['domainName']);
+									}
+									if ($domainRecord['forced'] && !isset($firstFoundForcedDomains[$domainRecord['pid']])) {
+										$firstFoundForcedDomains[$domainRecord['pid']] = preg_replace('/\/$/', '', $domainRecord['domainName']);
+									}
 								}
 							}
-							$GLOBALS['TYPO3_DB']->sql_free_result($res);
 
 							// Set targetDomain to first found domain record if the target page cannot be reached within the current domain
 							if (count($foundDomains) > 0