I'm avoiding it, but i haven't yet heard of any slowdowns from updating. I rarely update GPU drivers anyway as they just seem to get more and more bloated as time goes on. Nearly 400MB now...geez...
On another note, it's nice of M$ to try and shill for Intel again on this issue by saying when using Win10 with the newest CPUs would have single digit impacts, yet Intel's own testing shows up to a 12% (looks like 2 digits to me) impact on a brand new 8700K
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