Slow loading of site using Visual Composer

First of all let me tell you the template and features are awesome.Great Job. I am having a couple of issues when loading the Visual Composer for editing. Sometimes it takes 2 to 3 minutes and also loses connections sometimes. This only happens when I am editing a page in Visual Composer. Also I am on high speed fibre optics at my end as well as a dedicated IP address with a hosting company that also has fibre.

One other problem that has occurred is when I use the Live Color Customizer I see the following error messages come up at the top of the screen and then disappear.
Warning: Creating default object from empty value in /home/innmar/public_html/wp-content/themes/HighendWP/admin/theme-customizer.php on line 15

Warning: Creating default object from empty value in /home/innmar/public_html/wp-content/themes/HighendWP/admin/theme-customizer.php on line 18

I don’t know if this is serious as everything seems to work fine after the errors disappear