I just glanced over the options it changes. From what I can tell it:
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enables GPU rendering for some canvas2d options
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doubles cache sizes for almost everything
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disables some speculative prefetching
I cant imagine these options are making a 30% speed difference, outside of some very specialized tests. But, I also haven’t tried it so I could very well be wrong.
20 grand for a full 100 point boost to your IQ seems like a pretty good deal.
Like, for the price of a new car I can be smarter than Einstein and realize I probably wasted that 20 grand.