Virtuemart - Change Ascending / descending sort default on Browse page

Make a change to the file located in,

administrator/components/com_virtuemart/html/shop_browse_queries.php

Line #23

$DescOrderBy = $vmInputFilter->safeSQL( $vm_mainframe->getUserStateFromRequest( "browse{$keyword}{$category_id}{$manufacturer_id}DescOrderBy", 'DescOrderBy', "ASC" ) );

Change to:

$DescOrderBy = $vmInputFilter->safeSQL( $vm_mainframe->getUserStateFromRequest( "browse{$keyword}{$category_id}{$manufacturer_id}DescOrderBy", 'DescOrderBy', "DESC" ) );

Virtuemart- Set the number of products per page

Add $limit=5; in line after $ps_product_attribute = new ps_product_attribute;
in /administrator/com_virtuemart/html/shop.browse.php