I get mini lags just as much as the next person but I kept the HDD from my previous config which was 5 if not more years old back then... So could a new HDD or potentionally even an SSD solve this issue?
As for mouse DPI I found that playing on the lowest DPI with 6 sens is perfect for my sniping dispite the tips of having higher DPI and lower sens, Headshot! logic amirite