One way to decrease the load times for SharePoint is by using structured navigation in a publishing site collection. There are several benefits of structured navigation: it is security trimmed; automatically updates when new sites are added; and does not require customization of the master page. This video walks through the steps to use structured navigation to improve page load performance.
For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy . Also, if you need any further assistance then you can raise a support ticket and get it addressed.