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Microsoft says security fixes will noticeably slow older PCs

From Engadget - January 9, 2018

If you have a PC with a 6th-generation Intel Core processor or later, you should only see a hit in the "single-digit" percentage range.That's small enough that you might not notice a thing.If you are using a 4th-generation Core or older CPU, however, you will see "more significant slowdowns," some of which could be noticeable.And that's if you are using Windows 10.Most Windows 7 or 8 users on similar hardware should notice the effect, while Windows Server is bound to take a more substantial performance blow due to its heavy dependence on I/O.

The newer parts are not as badly affected since Intel can limit the instructions it uses to disable branch speculation (used in the exploits to snoop on protected memory).Windows 10, meanwhile, is faster because it tosses out some legacy approaches to switching between user memory and kernel memory.

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