Microsoft says security fixes will noticeably slow older PCs
 

It's been clear for a while that the fixes for the Meltdown and Spectre memory vulnerabilities would slow down PCs, but just how bad is the hit, really? Microsoft has run some benchmarks, and it's unfortunately bad news if your system is less than f...

https://www.engadget.com/2018/01/09/...rformance-hit/