I have a small multisite installation running on AWS micro instance as I tweak to bring online. It's a vanilla install but I have added this plugin, the Ultimate Coming Soon Page plugin and the Genesis theme.
I am using IP address with domain mapping, not cname.
When I browse directly to a site http://MyDomainName.server.host.com it resolves quickly. When I instead, after editing the A record on the MyDomainName DNS to be the IP of the server, browse to http://www.MyDomainName.com there is a 10 second difference in performance. 3 seconds for direct and 13 for domain mapped.
Using the Ultimate Coming Soon Page plugin, when active any of my domains resolve to a placeholder page. This also uses the Domain Mapping plugin but then resolves very quickly.
I am frustrated and confused as the experience seems to indicate that either the backend is slow or domain mapping is slow, but the results (to me at least) seem to be in conflict. If domain mapping were slow then why would it resolve quickly to the placeholder page AND if the backend were slow and it was the domain mapping plugin causing the issue, why would the direct and full URL resolve so quickly?
Admittedly I'm a bit of a newbie when it comes to wordpress multisite on linux and this is likely something I've done wrong or incompletely, but I've invested a ton of time trying different approaches and am not getting anywhere. Any help would be appreciated. Thank you in advance.