Again the profile in 1.x and 2.x are very different, with different purposes. 2.x is targetted towards quality. You can speed it up by customizing profiles and removing overheads at the expense of quality.
Since you're looking at M4V I would suggest study the handbrake CLI options to see what options are there to speed up the conversion
Since you're looking at M4V I would suggest study the handbrake CLI options to see what options are there to speed up the conversion