In the function
PrliClick.php there is a query to make sure there are no collisions. But it is doing it in the most inefficient manner possible.
$query = "SELECT DISTINCT vuid FROM ".$this->table_name;
This grabs an array of every click in the db (in our case it was around 200k and tanked the mysql server if a bunch of clicks came in at once)
This could easily be done using the a count() check with vuid = $vuid