Greetings,
I just installed monox on my server and noticed it was very slowly loading up so I checkt if it was the same with your demo site and it in fact is. So at first I thought it might be a problem with monox but as I used any other browser I experienced the following:
Opening any site of monox in Chrome or Internet Explorer takes reasonably long (reasonably as in Internet Explorer 11 still needs a lot of time doing the javascript stuff), but using Opera I spend about 20 seconds overhead loading any monox site.
I am not experienced in browser profiling or tracing those kind of problems down so you would very much appreciate your help!