Domain mapping plugin affecting multisite speed

Hello,

It seems that Domain mapping plugin is affecting my multisite speed down. I’ve tried to disable all my plugins and I think I’ve identified DMP as one culprit..

Is that possible? I’m running WP3.5 on WPengine. Other WPMU plugins network activated: multisite privacy, new blog templates, ultimate branding and wpmu dev dashboard. Currently, only 1 site is using a domain redirect.

If yes, what could I do to fix/optimize it?

Thank you very much for your help

Regards

Jean-Louis