Question-and-Answer Resource for the Building Energy Modeling Community
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You can run multiple simulations in parallel, but you cannot parallelize a single simulation, due to the nature of what's happening (all calculations must happen in a defined order).
You could break up your simulation in 12 monthly runperiods and collate the results after the fact, loosing a bit in accuracy though. This has been discussed for eg here: https://unmethours.com/question/38611/parallel-simulation-for-single-idf-file-in-energyplus/ and if my memory serves, this is something that JEplus / JESS client does for you.
Shading calculations can be run on the GPU. See https://bigladdersoftware.com/epx/docs/9-6/engineering-reference/shading-module.html#pixel-counting
