This also occurs on PS5, though it's not quite as slow on the newer console. What does PlayStation 5 or PlayStation 4 copying update files mean? Why is your PS5 or PS4 copying update files? Why does copying on PS5 and PS4 take such a long time? On PS4, once you've downloaded a game update, the console will begin a tedious 'copying' procedure, which can take a long time.
