gistfile1.diff

Index: cms/moodle/mod/ibis/lib.php
===================================================================
--- cms/moodle/mod/ibis/lib.php	(.../2012_09_RC_v33.5/src/cms/moodle)	(revision 7894)
+++ cms/moodle/mod/ibis/lib.php	(.../2012_10_releasecandidate_newdb_v33.5/src/cms/moodle)	(working copy)
...
-        //Error handling (retry loop)
-        do {
-            $result = QDB::question("ibis-cms",$sql);
-
-            if ($result === FALSE) {
-                error_log("Unable to get answer from database as to whether assignment ID #" . (int) $wid . " has been attempted by students or not.");
-                $retry_wait_time = ($retry_wait_time + 1) * 2;
-                sleep($retry_wait_time);
-            }
-        } while ($result === FALSE);
-
+        $result = QDB::question("ibis-cms",$sql);
+        if ($result === FALSE) {
+            error_log("Unable to get answer from database as to whether assignment ID #" . (int) $wid . " has been attempted by students or not.");
+            return FALSE;
+        }

and fix bellow.

possible cause and solution admin slownes.