Extraction speed is slow.

Aug 2, 2018
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Why my extraction speed is so low? I bought this PC a few months ago and worked fine until now. When i first started to unzip files the speed was around 30 mb/s and now is barely 3 mb/s if I'm lucky.
Proccesor: Intel Core i5-7300HQ, 2.5ghz up to 3.5ghz
HDD & RAM: 1TB DDR4
Video: nVidia GeForce GTX 1050 4GB