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© (c) Copyright Thomson Reuters 2018.Microsoft says security patches slowing down PCs, servers
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lostrune2
"Microsoft Says Windows 10 PCs Running Haswell Or Older Intel CPUs Can Expect Significant Slowdowns Post-Spectre Patch"
https://hothardware.com/news/microsoft-windows-10-pcs-haswell-intel-cpus-significant-slowdowns-post-spectre-patch
Not sure about Windows 7 and 8 PCs running on newer processors.
Don't know yet if Apple, Linux, and Google have said how much their devices will slow down.
mmwkdw
One wonders whether this is a collusion between different manufacturers in an attempt to stimulate sales for newer devices in cohort with the major OS vendors. I say this since, why would ARM and Intel who operate completely different Microprocessor architectures and designs be both impacted. Something smells fishy here.
lostrune2
A lot of answers can be found here:
https://spectreattack.com/
Basically, the cpu design flaw goes back decades (around early 90's) - in a bid to make chips perform ever more faster and faster
Fundamentally, both exploits use somewhat similar core concepts. All modern processors use various features and techniques to improve performance - including out-of-order execution, branch prediction, and speculative execution (basically like pre-fetching, predicting what would be the next instruction). However, all of these have the potential to execute code that shouldn't be allowed.