We have pulled back the implementation for Google's mod_pagespeed as it requires mpm_prefork, which is considered a more resource intensive mpm in Apache and pages with lots of errors (HTML Errors) will cause additional Disk I/O on the server. Given Zen Cart's already hungry operating status we think this should wait at least until mod_pagespeed is out of Beta testing.
I wanted to take a moment to thank you for encouraging me to take the time to upgrade and maximize my web site potential. Already, in less than a full month, we are seeing visits and hits more than 5X what our "Yahoo Small Business" set up provided us. Additionally, the numerous options and breakdowns available on your control panel make marketing and following up with my clients so much easier and efficient.
I look forward to continued traffic growth and increased business from our site.
Thanks so much for all of your help,
Best Regards,
Matt & Debbie
Where Flowers Bloom