Is there any option to change the batch size when printing large volumes of invoices?

The customer is printing large number of invoices at once by selecting around 100 invoices in the Print Invoice window. The invoices are printed slowly, and when you refresh, you can see only a small number of invoices are being printed. When you again refresh, you can see the number of printed invoices are increased.

My questions are,

1. Is there any option in IFS APP10 where we can change the number of invoices printed for a given time?
2. Are there any ways to speed up the printing?