I have a HP Photosmart C4680, printer, scanner and copier.
Although it will print A4 sheets at a reasonable speed, when I want it to print an address on a DL envelope, it takes a good few minutes before it decides to print the envelope.
Because it has to do more in sorting out positioning and layout for the address.not just print a sheet of text beginning to end.It has to work out more to get the address in the correct place
Oh I see, what you mean is that you print addresses onto specific sticky back labels and then stick them onto the envelope?
I also do this for my Christmas card envelopes when I have a number of addresses to print, but find it a little unpractical if one needs to print one single addressed envelope.