I have a large site and it takes 30 seconds to load. Completely unacceptable. I wonder if any of you can offer some suggestion to resolve this?
Without knowing your specific site's URL, setup, theme and the plugins installed there is no way for us to know.
Run your site through GTMetrix.com. The resulting report will tell you exactly what needs to be addressed.
In most cases image size (loading images whose physical sizes are larger than needed to display) and compression are the main issues.