Speed Increase

Incorporate these index:

ALTER TABLE `category` ADD INDEX ( `parent_id` ) ;
ALTER TABLE `category` ADD INDEX ( `top` ) ;
ALTER TABLE `category` ADD INDEX ( `sort_order` ) ;
ALTER TABLE `category` ADD INDEX ( `status` ) ;
ALTER TABLE `option` ADD INDEX ( `sort_order` ) ;
ALTER TABLE `option_description` ADD INDEX ( `name` ) ;
ALTER TABLE `option_value` ADD INDEX ( `option_id` ) ;
ALTER TABLE `option_value_description` ADD INDEX ( `option_id` ) ;
ALTER TABLE `order` ADD INDEX ( `customer_id` ) ;
ALTER TABLE `product` ADD INDEX ( `model` ) ;
ALTER TABLE `product` ADD INDEX ( `sku` ) ;
ALTER TABLE `product` ADD INDEX ( `upc` ) ;
ALTER TABLE `product` ADD INDEX ( `manufacturer_id` ) ;
ALTER TABLE `product` ADD INDEX ( `sort_order` ) ;
ALTER TABLE `product` ADD INDEX ( `status` ) ;
ALTER TABLE `product_option` ADD INDEX ( `option_id` ) ;
ALTER TABLE `product_option_value` ADD INDEX ( `product_option_id` ) ;
ALTER TABLE `product_option_value` ADD INDEX ( `product_id` ) ;
ALTER TABLE `product_option_value` ADD INDEX ( `option_id` ) ;
ALTER TABLE `product_option_value` ADD INDEX ( `option_value_id` ) ;
ALTER TABLE `product_tag` ADD INDEX ( `product_id` ) ;
ALTER TABLE `product_tag` ADD INDEX ( `tag` ) ;
ALTER TABLE `url_alias` ADD INDEX ( `query` ) ;
ALTER TABLE `url_alias` ADD INDEX ( `keyword` ) ;
ALTER TABLE `user` ADD INDEX ( `username` ) ;
ALTER TABLE `user` ADD INDEX ( `password` ) ;
ALTER TABLE `user` ADD INDEX ( `email` ) ;

and remove category counts

perhaps with this ext: http://www.opencart.com/index.php?route=extension/extension/info&extension_id=4246