merlin867 on "Add a waiting time for admin"

Hello everyone,
First, I would like to apologize for my english. I'm french so it's not so easy for me.

For my problem I did a little research. but frankly I'm not sure what I'm looking for exactly ! :/

I have a part of my plugin that find info on another website and made ​​the parsing to retrieve specific information. So far, all is well. In fact, the script works fine. The only point where I do not know what or how to do is on the wait. Because for each record in the database , there is a waiting time of about a 1-2 sec. This waiting time will not be "lived" by the user, but only by the admin who decide when to trigger the update procedure .
Here is the code that is triggered by the administrator :

global $wpdb;
    $price_query = 'SELECT * FROM wp_prix';
    $price_list = $wpdb->get_results( $price_query );
    foreach ( $price_list as $price ) {
        $monprix = afficher_prix($price->url);
        $monid = $price->prix_id;
        echo $wpdb->update( 'wp_prix', array('prix' => $monprix ), array( 'prix_id' => $monid));
    }

The waiting time is at "afficher_prix($url)" function.

Is there a way to perform the processing in background or put a " rolling circle " or a progress bar in the meantime? For the moment, at the stage of creating the plugin I have a dozen recording. So the wait time is minimal , but when I turn it on I expect nearly a thousand recording ... This will dramatically increase the waiting time .

I am very open to suggestions !
thank you
Francois