Super speedy re-encoding
If you think QuickTime is slow, you’re not alone. But there’s a cure :-) Use an Elgato Turbo.264 or Turbo.264 HD hardware encoder to export your subtitled movies in blazing speeds.

When the Turbo.264 or Turbo.264 HD is connected and utilized you will see a little turbo-icon in the batch window.

Here we get around 50fps with the old Turbo.264

And this is the blazing speed we get using the new Turbo.264 HD. Over 120fps in average!