Slow printing

Thanks imran80 for posting this and following up via Microsoft Support regarding this.

As confirmed on our calls -

1. Each print action by user is broken into multiple jobs that are sent at the same time (serially one after the other). Each job has its own processing time, and a combined time will seem large. Some API calls for next job can be parallelized while maintaining the job order - we are discussing this offline :).
2. Universal Print connector processes jobs serially too for a specific printer. In other words, next job on the printer will not be pulled from cloud until the previous on that printer is not marked as complete by Windows spooler on connector. Each job depending on the print payload content (PDF here) can take some time to finish. 
3. We recommend considering use of Universal Print ready printers - this can avoid an additional hop of going via connector. Please work with your OEM if you see performance issues on Universal Print ready printers. As you have some Universal Print ready printers, we followed up with your vendor and they are willing to investigate it. However, they mentioned that PDF payloads can take a bit longer on the printer due to amount of processing required. Each PDF file will have a different time to process!

Thanks for your patience and continuing to work with us. Hopefully we can help your case and guide you appropriately here.

For any new asks or work required, we suggest you open an item (or upvote if already exists) here - https://aka.ms/UPideas.

Thanks

Saurabh