Good specs, but games still don't run well?

Feb 23, 2018
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So I recently built a computer with
striX Z270E Mobo
i5-6700k
GTX 1060 6Gb
And 16 GB of DDR4
But can barely run SWTOR with settings set all the way up. I can't even play Subnautica with settings on low
What's the deal?