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A comment on Microsoft says security fixes will noticeably slow older PCs.

Re:Microsoft says security fixes will noticeably slow older PCs by Scaevolus on Tuesday January 09, 2018 @09:04PM (#16112026)
An instruction added as a curiosity / micro-optimization back in 2010 is now very important.

Previously: "PCID is now a critical performance/security feature on x86" https://news.ycombinator.com/item?id=16094349

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