"To shoulder the load" means to take on or accept responsibility or a burden, usually to support or help someone or to complete a task. Full definition
You must specify which default home page should load on the user machine. (thewindowsclub.com)
Your page should load in 15 seconds or less — even on a slow computer. (realtormag.realtor.org)
He also states that relevant, quality content is still key to SEO, internal linking is an important SEO factor, and sites should load quickly. (blog.hubstaff.com)