The time that is needed to print a document depends on printer's characteristic. All printers like computers have processors and the speed of processing documents may differ depending on printer's performance. But in some situations the amount of information can bee large and printer may need additional time to process a document. This depends on the document. You may attach it to your message or send over private messages.
Thank you for the idea of previewing documents. We will take it into consideration for developing new version.
If you mean that Document Server doesn' print left and upper borders of spreadsheets, this will be fixed in next versions of our product.
Thank you for the attеntion to ONLYOFFICE!