[Tu Tran]

Hi,

The SNS Nova is not supported this. Normally, Magento site is slow. Please enable Cache on Admin and try to use module full cache page to increase speed. You can install:
– http://www.magentocommerce.com/magento-connect/pagecache-powered-by-varnish.html
– or http://www.magentocommerce.com/magento-connect/lesti-fpc-simple-fullpagecache.html

Also, you can follow these links below to speed up the site:
http://www.demacmedia.com/magento-commerce/4-simple-but-effective-ways-to-improve-magentos-performance/
https://www.properhost.com/members/knowledgebase/24/10-Ways-to-Speed-Up-Your-Magento-eCommerce-Site.html

Best regards,