I have a client complainging that their Domain Mapped site is slow, so I used http://wordpress.org/extend/plugins/p3-profiler/ to have a look at what migth be causing the slowness.
That site's load time is 46% attributed to the "WordPress MU Domain Mapping" plugin - 1.4 seconds. (the plugin is up to date)
Other sites on my multisite attribute a sizeabel percentage of their load time to the DM plugin too: 31%/.5s or 34%/.77s
Is it slow for other people?
Any clues how to stop it's slowness?