The page width default has caused me to use columns to use the entire width. I’m not clear as to the difference between the edit and publish modes regarding the page width (although they clearly vary).
There is a requirement to have a library of documents on-line. This does not necessarily mean on the host server or the website itself, although there are plugins for document management. NB There are two types of document management – user based and admin (for the internal website structure).
There are apps in my StorURL for optimizing the website. Caching seems to be a primary method to improve performance.
To this end, there are plugins to improve the performance of Twitter embed.
Change the new on-line bookstore link from a Twitter embed to a linked image.