This is not an image optimisation issue.
This is not a caching issue.
This is some issue with the server, or something weird in the code that's causing a 10 minute load time on the 2nd half of our home page.
Fluent English only - no exception.
Fixed price - paid on solving the problem.
The problem solution may involve server issues AND code issues. You may need to deal with BOTH issues.
cpanel server on a shared host so no root access.