--min-cu-size 8 is the parameter you want to use. Have you set the preset to "ultrafast" - that's the only one that defaults to min-cu-size of 16. And isn't going to give you great results, and might not be that much faster given source decoding and other operations. At least try superfast and keep going until encoding gets too slow for you.
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Ben Waggoner
Principal Video Specialist, Amazon Prime Video
My Compression Book
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