I have been installing bug fixes on a number of Windows 7 computers lately and it has not gone well. Windows Update found the missing patches and installed them, but it took a loooooooooooooooooooooong time. Even machines with fast SSDs and a fast connection to the Internet, were painfully slow.
Last night one machine was taking so long to determines the missing fixes, I gave up, went to bed and let it run overnight.

Windows Update running on Windows 7
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Source: COMPUTER WORLD