You're welcome to submit a ticket if you think there's a platform performance issue that's causing problems for you.
However, I would also recommend seeing if you can reproduce the issue without any 3rd party themes, plugins or applications to rule those out as causing the issue.
I did take a brief look at your site, which was loading fairly quickly (and complete) as a guest, your custom theme was adding more overhead with the effects. One thing that you can implement quickly to improve performance is a cache policy for your static files (such as images, javascript, css). This is something that is controlled at the server level, you can (if you're using Apache) use a .htaccess file with mod_expires rules to control this. There's a good example of relevant rules here: https://invisioncommunity.com/forums/topic/449164-how-to-speed-up-ipb-sites/?do=findComment&comment=2766078
However, since this is moving more from 'feedback' to technical support, I would recommend either submitting a ticket if there's a reproducable issue we can look at otherwise you may want to post in the peer-to-peer section of our community and other members (@adlago!) can give you some tips