https://www.thurrott.com/cloud/14991...ally-older-pcs

TL;DR: PCs with older CPUs and Windows are being hit the hardest, but here’s a breakdown, anyway:

  • Most users on Windows 10 devices with Skylake, Kabylake, or newer CPUs will not notice a change in performance, and benchmarks show single-digit slowdowns.
  • Some users on Windows 10 devices with older CPUs such as Haswell are expected to notice a dip in performance, and benchmark reports have shown “more significant” slowdowns compared to newer CPUs.
  • Most users on Windows 7 and 8 devices with olde CPUs like Haswell will notice a decrease in performance. This is mostly due to the fact that the Windows kernel features legacy design decisions, which have been improved with Windows 10.
  • As for Windows Server, the patches are expected to show “more significant performance” impact on any processor when the mitigation is set to isolate untrusted code within your Windows Server instance. Be careful when patching your servers, basically.