Game lags even though at high settings

hello i been having issues with beam ng drive after 5.1.0 or something before that were the game lags horribly even the before that my computer was able to handle it here are my specs

Gigabyte Radeon 5770 1GB
16 gb ram from pny
I5 4440 CPU AT 3.10 GHZ
1 Tb hard drive WD Blue
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every update it seems the lag gets worse and worse its really bad right now at 6.0.1