Speed up opening of documents from SharePoint Online
Whether opening documents from a mapped network drive or the SharePoint Online site, Office 2016 programs show "Contacting Server..." "Processing..." multiple times and supposedly this is a design limitation. So it takes between 8 and 10 seconds to open a 64KB file. The recommendation to speed up the opening of files to facilitate faster workflow.
Aside: The sync client is not an option, we use small SSDs and cannot sync our SharePoint Libraries to them.