You don't have to check the Separate Process box.

Separate Process is a little slower than in-process, since it requires process-to-process communication, with quite a lot of data to be transferred.
An advantage of rendering in a separate process is the fact that it can render more complex scenes than the Poser in-process renderer, due to the fact that this separate process does not have the overhead of a user interface - it's the render engine, a little bit of communication logic, and that's it.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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