swift_performance_admin_notices
You can filter admin notices array
Parameters
$messages
array of message arrays
Return
array of message arrays
Example
add_filter('swift_performance_admin_notices', function($notices){
$notices['custom-message-id'] = array('message' => 'I just added a custom message with filter', 'type' => 'success', 'permanent' => true);
return $notices;
});