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Hardware decoding even at 8k is very common, intel has had 4k VP9 hardware decoders since 2016. Comparing the i7-3520M to something modern like an AMD 5800U the modern chip has ~2x single and ~4x multi-core performance, about the same compared to a M1 MB Air. Compared to 2012 they're all in the same ballpark.

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On my X1 Carbon with the 10th Gen Core i7 processor which also happen to have VP9 hardware decoders, the fans still spin up. They're not very audible but the machine gets warm to the touch. On my M1 MBP? 4K video playback does nothing to it. Absolutely dead quite, no fans spinning, cold to the touch all throughout.

I thought Apple didn't embrace VPx codecs because they were made by Google? Last time I looked, VideoToolbox only supported hardware-accelerated H264 and H265. So I assumed that all VP9 decoding must happen in software.

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