First of all, I'm spanish and I don't speak english very well, so, sorry for the mistakes.
Thank you for using the Support Forum. Your English is very good!! I am not sure why you are seeing this on the clients. Please take a look at this doucment and see if the instructions for turning off the Bi-Directional Communication will help with your situation. I hope this helps if not please consider contacting your support centre for further assistance.
Try the following:
This might speed things up.
Make sure you do not have a network issue or driver instalation issue.. IF this only happens on this printer you it should no be network related.
Thank you both!!
It seems to work better now.
It just takes a few seconds to display any window!
Again, thanks. It would have been impossible without your help.