Unless I am missing something it appears that Acrobat Distiller is only able to process one file at a time. I feel like there is a missed opportunity here to take advantage of modern multi-core CPUs and allow Distiller to at least process as many files as there are logical cores on the CPU at the same time. For example I was recently tasked with converting a few hundred files to PDF and it took approximately an hour and a half but if it were able to process 16 files at a time (my CPU has 16 logical cores) I estimate it would have completed the task in around 6 minutes which is an immense time savings.

Thank you for your consideration!