We have a multi-site setup using a Windows server running IIS7. The website was running great until we added this plugin to support some new domains.
If I deactivate and remove the MU Domain Mapping plugin, the load times are very quick. When I activate the plugin, it adds about 10 seconds of time for the domain to resolve to the correct directory.
Any help or suggestions on how to resolve this would be much appreciated.
FYI, we are not using a caching plugin.