From what I understand, it’s not really free. In fact, incredibuild is incredibly expensive. Unfortunately Epic hasn’t really seen fit to allow us to cluster shader compilation, which is a massive shame, especially seeing as how the shaders are getting more complex and taking much longer to compile. Zero advances on that front is kind of depressing.
They are going to need to either let us cluster build or something. Using the GPU to aid in compilation isn’t completely out of the question, but likely completely inefficient compared to CPU compilation (or maybe not, I dunno)
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