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It's been the case with a lot of firmware updates to the PS4 that the only thing we get in the patch notes is that it improves the quality of the system performance (although they've often mentioned stability as well), and this is the case with the most recent update as well, 4.71, which does exactly the same thing.
Of course, the internet being a place of trolls and jokers, the Reddit thread was quick to respond with jokes about these repetitive phrases, especially regarding stability, but all jokes aside, this should include a number of unspecified bug fixes and optimisations. Have you noticed any changes?