zc157a introduced a popover functionality to the orders' listing to quickly view the products that are in a specific order. If the associated site has a bunch of attributed-products, that can significantly slow down the rendering of the orders' listing display.
You can change the behavior by editing the
core-file /admin/orders.php. Find (close to the top of the file):
Code:
$quick_view_popover_enabled = false;
$includeAttributesInProductDetailRows = true;
and change to
Code:
$quick_view_popover_enabled = false;
$includeAttributesInProductDetailRows = false;