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Microsoft Security – Spectre and Meltdown performance impacts on 2015 and earlier CPUs

The most performance impacts will be older WIN7 devices as documented below:

Understanding the performance impact of Spectre and Meltdown mitigations on Windows Systems

Performance slowdowns will be most apparent for older Windows client systems, such as Windows 7 and Windows 8, particularly when using Intel Haswell chips on “2015-era PCs,” according to an announcement by Terry Myerson, executive vice president of the Windows and Devices Group. Microsoft expects “most users to notice a decrease in system performance” on these older Windows clients.

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