My site is using BeTheme, Visual Composer and Ultimate VC Add-ons. The site has white borders and looks squeezed for a few seconds before loading. I have WP SuperCache on at the moment.
and also the menu jerks into place in an unsightly way. I created a temporary animated opacity css preloader so that you an see it instead of on the white background:
Comments
please show us on the screenshot what you mean exactly because we didn't noticed such behave on your site and we checked on few different computers.
AFTER LOAD: