diff --git a/typo3/sysext/core/Classes/Cache/CacheManager.php b/typo3/sysext/core/Classes/Cache/CacheManager.php
index ff4b18d..ceeed3c 100644
--- a/typo3/sysext/core/Classes/Cache/CacheManager.php
+++ b/typo3/sysext/core/Classes/Cache/CacheManager.php
@@ -173,6 +173,7 @@ class CacheManager implements \TYPO3\CMS\Core\SingletonInterface {
 			foreach ($this->cacheGroups[$groupIdentifier] as $cacheIdentifier) {
 				if (isset($this->caches[$cacheIdentifier])) {
 					$this->caches[$cacheIdentifier]->flush();
+					sleep(3);
 				}
 			}
 		}