I would recommend that you contact your hosting provider about this, they should be able to help you
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I have a Vps account at Nordic VPS. A package with 512 MB rand 1000 Mhz, running Ubuntu 10.10.
With basic webserver setting is it normal that a simple page, like the php info page, to have like 20-30 seconds delay on multiple clients ?
I used loadimpact.com to do a stress test on the server. I had ubuntu updated, apache and mysql with phpmyadmin running. I used a tutorial on howtoforge com to install these.
I have an almost identical VPS at Burst.net, running CentOS (same RAM, same processor). Here's the results of the LoadImpact.com test for one site on it (a database-intensive Wordpress site that "auto-blogs" several member RSS feeds). Under 5 seconds for up to 40 users, and then it jumps to 8 seconds at 50 users. (I can see I have some more tweaking to do!)