To begin with, the images in your slider are way too big and this delays loading the content. Try compressing them more.
The slide background image overflowing the rest of the content during page load can be fixed with this custom CSS:
.flexslider .slides > li {
position: relative;
}
The theme doesn’t support a footer navigation but you can add one in the footer sidebar.
Apparently there are some CSS bugs in when displaying the blog in full screen mode with a sidebar. This CSS should fix it:
@media (min-width: 992px) {
.design-full-screen.layout-content-sidebar .hentry {
margin: 0 70px 40px 0;
}
.design-full-screen .sidebar-primary.custom-sidebar {
padding-top: 0;
padding-bottom: 0;
}
}