Server resources performance

Hi,

i have 2 questions about Order status Rules plugin:

1- my current setup is>>
all my products are virtual (digital codes) so all orders are completed to deliver the serial or code
i use this function.php code to change order status from processing to completed:
===============================================================
add_action( ‘woocommerce_order_status_processing’, ‘processing_to_completed’);

function processing_to_completed($order_id){

$order = new WC_Order($order_id);
$order->update_status(‘completed’);
===============================================================

and all is good, but now i have specific products that i don’t need it to be completed & stay processing

so if i removed the above code all orders will be processing & will use your plugin to change other processing to be completed.

is that the best solution?
because let’s say the products i need to stay processing are 3-5% of my orders but about 95% i need them completed so do you recommend this solution ? or you have better idea?

and if i use your plugin and make the interval to change order status to be 0 that means it will check all orders to change the status based on rule which means will give a heavy load on the server or it doesn’t work like that & will not affect the performance ?

2- do you have life time license ?

THx