1) You will need a database with a lot of data that leads to a long search time. Or you can cheat and just sleep() in whatever engine you are using: --- a/search/engine/simpledb/classes/engine.php +++ b/search/engine/simpledb/classes/engine.php @@ - 54 , 6 + 54 , 8 @@ class engine extends \core_search\engine { public function execute_query($filters, $usercontexts, $limit = 0 ) { global $DB, $USER; +sleep( 5 ); 2) Load two search pages in two tabs /search/index.php and search at the same time. 3) While the searches are completing the second page should not be blocked. ie with a 5 second sleep, the second search should take 5 seconds, not 10 seconds.