I have on server: CloudLinux 2.6.32-379.5.1.lve18.104.22.168.1.el6.x86_64 on cPanel WHM 11.34.0 (build 7) Server it is quad-Xeon, 8GB RAM, sas-disks 3ware raid I have onlu about 30 account LVE settings are default: 25% 1GB RAM On two customers account (both have joomla 1.5 + virtuemarkt) there is a problem with very often Error 500 caused by Max Virtual Memory usage. When I raise up memory to 2GB - after couple of days problem appears again. When there is a problem with Max Virtual Memory usage - joomla-site has about 100 unique users online. My php configuration is php 5.3 working as suPHP. 1. What can I do (how) to diagnose the resource consumption of customer's script ? 2. Is it possible that the problem is caused by suPHP ? (maybe change php to fastCGI will resolve the problem) ?