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it's funny how different shows/videos have different ideal speeds i settle into. not sure if i can nail down exactly all the factors, but audio balance (specifically dialogue vs. music volume), subtitle reliance, and visual relevance all play a role.
youtube videos easily 2.5x minimum, anime can range from 1.6x to 4x, western tv/movies usually around 2x because of shit balance but can sometimes push it higher.
one time i watched through all of Lain at 8x because 1) i know the dialogue and there isn't much of it, 2) the visuals linger, 3) the flashing is a nice recontextualization method and it was really fun :3