PHP 7.3 PDO - SQLServer - Bulk Upgrade Issue

Question

I receive an XML file that contains the updated details of the inventory and I need to process the xml to update the database.

Currently the routine looks like this:

    $SQL = "EXEC sp__ReviseInventoryStatus :ItemID,:Quantity,:Price";
    $rs= $DB->prepare($SQL,[PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL]);

    foreach($xml->Item as $T)
    {
        $rs->bindParam(':ItemID', $T->ItemID, PDO::PARAM_STR);
        $rs->bindParam(':Quantity', $T->Quantity, PDO::PARAM_STR);
        $rs->bindParam(':Price', $T->Price, PDO::PARAM_STR);
        $rs->execute();
    }
    

where sp_ReviseInventoryStatus is a simple:

Update Items set Quantity=@Quantity, Price=@Price where ItemID=@ItemID

I created the required index in the table to increase speed, and everything seems working well.

But since items to update are often more than 150K and Items in the Items Table are more than 2M... it usually takes more than 30 minutes to complete the job..

Therefore I'm searching for a a better way to perform this task.

Can someone suggest a path?