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LPub - optimise rendering speed - Jetro de Château - 2018-04-25

When I use LPub, I spend a lot of time waiting for pages to render. I'm trying to find out if there is anything I can do to speed up this process.
I am using a new laptop (i7 CPU) with a powerful graphics card (NVIDIA GTX 1050 - 4GB GDDR5) but that doesn't appear to have any impact on the rendering speed compared to my 6-year-old laptop I used before this one.

What can I do to speed up the rendering process? 

I have a feeling files are rendered one at a time in sequence. Is there a way to run several renderings at the same time (would that improve the overall speed)?

Some additional info:
After reading this thread I have turned off 'Single call multiple rendering'
Note I am not looking for a faster rendering speed when creating the final PDF version (that would be an added bonus). I am looking for a reliable way to make my document editing flow faster.