Thanks for the warning.
igneous, please take it into consideration and DO NOT use persistent connection in shared server.
I'll suggest you to optimize your sql query. Minimize join and union queries and try again. If it is still slow even to run a simple sql query, you may want to file a ticket and ask support to check the server.
$50 off and 3 free domains with code: [color=#CC0000]DH3[/color] [url=http://dreamhost.com/r.cgi?296804/signup|DH3]Sign Up NOW[/url] or More Codes Here