If you need an immediate 1-on-1 response, Adobe Support provides chat and phone support. To reach chat or phone support go to<http://helpx.adobe.com/contact.html?product=muse&topic=using-my-product-or-service> and click on "I still need help…".
The forum has the drawback of no guaranteed response offset by the potential benefits of reaching many fellow users and the development team, in addition to the Muse support team.
What version of Muse are you using?
What OS version are you running?
How many pages are in your site? Roughly how many images? What's the size of the .muse file on disk?