Please understand that we can’t help with this kind of issue as part of our theme support. If you need help optimising the performance of your website you will need to consider hiring a professional. In this Help Center we really need to focus on theme support specifically else it will mean slower responses and less support for everyone. Thanks.
If you have performance issues, try running the page through pingdom to see if you can analyse what the problem is.
Pingdom tools → http://pingdom.com/tools
If you identify a problem that you think is being caused by the Mingle theme then please let us know and we will look into it.