Joomla Virtuemart网站sh404sef插件使网站极其缓慢

My Virtuemart joomla (Version 1.5.15) site when I activate sh404sef (ver 2.1.9.787), it slows down the site dramatically.

How can I fix this?

Check for following files:

administrator/components/com_sh404sef/custom.sef.php (unwritable) administrator/components/com_sh404sef/logs (unwritable)
administrator/components/com_sh404sef/security (unwritable)
components/com_sh404sef/cache (unwritable)

Turn on debug mode in global configuration and view a page in the front-end. See how many db queries are executed.

Now turn on your SEF extension - and repeat.

See all those extra db queries?

On standard shared hosting the additional queries can put you over your hosts the limit on db queries. Optimising queries, adding additio al indexes to your db can help. More powerful hosting is usually amore cost effective answer. Alternatively - stick with the built-in SEFwhich works fine if the site is structured optimally.

As stated by others - you are very vulnerable to attack - I *think*anyone can request a password reset on your admin account. Also - later Joomla versions contained many performance upgrades, as will later components.