diff --git a/resources/lib/UnityGroup.php b/resources/lib/UnityGroup.php
index d1616225..be94bb4e 100644
--- a/resources/lib/UnityGroup.php
+++ b/resources/lib/UnityGroup.php
@@ -62,8 +62,14 @@ public function getPIUID()
      *
      * @return bool true if yes, false if no
      */
-    public function exists()
+    public function exists(bool $ignorecache = false): bool
     {
+        if (!$ignorecache) {
+            $cached_pi_groups = $this->REDIS->getCache("sorted_pi_groups", "");
+            if (!is_null($cached_pi_groups)) {
+                return in_array($this->getPIUID(), $cached_pi_groups);
+            }
+        }
         return $this->getLDAPPiGroup()->exists();
     }
 
diff --git a/resources/lib/UnityUser.php b/resources/lib/UnityUser.php
index 4f88eac6..3df33d6f 100644
--- a/resources/lib/UnityUser.php
+++ b/resources/lib/UnityUser.php
@@ -154,8 +154,14 @@ public function getLDAPGroup()
         return $this->LDAP->getGroupEntry($this->uid);
     }
 
-    public function exists()
+    public function exists(bool $ignorecache = false): bool
     {
+        if (!$ignorecache) {
+            $cached_users = $this->REDIS->getCache("sorted_users", "");
+            if (!is_null($cached_users)) {
+                return in_array($this->uid, $cached_users);
+            }
+        }
         return $this->getLDAPUser()->exists() && $this->getLDAPGroup()->exists();
     }