A family of Microsoft word processing software products for creating web, email, and print documents.
When a document is opened on a machine on which the template, from which the document was created. is not available, by default, Word attaches the Normal.dotm template to that document and that normally does not significantly impact the time taken to open the document.
There are however other features of a document that can significantly impact the time that it takes to open documents, one of those being links to other documents that may not be available, particularly when those links are in a header or footer that may not be present in the document.
If you send me a copy of some of the documents, referencing this thread in the covering email message, I will investigate the issue.