It loads faster for me without any error:
It seems related to server performance since the issue is not consistent. Would you mind checking in with your hosting provider and ask if you are maxing out any settings?
Transparent area above footer is for your widgets. You have enable it on X > Theme Options > Footer > Footer widget areas: currently set to 4. Then you don’t have content. You can add content on Appearance Widget. If you don’t intent to add content, please set it None instead.
The transparent content around the white main content container is because of the margin set on the template. There are 40px top and bottom margin set to it. Do you intent to remove it?