Open Steam client.
Open library and choose Ark.
Right-click and open Properties.
In the General tab, select Set Launch Options.
In the command line type following lines with spacing:
-useallavailablecores – Makes your PC use all available CPU cores.
-high -Sets game as a high priority process.
-sm4 – Runs DX10 shader model.
-d3d10 – Runs DX10 mode.
-nomansky – Lowers in-game sky quality.
-lowmemory – Optimizes the game for 4GB RAM
Save your selection and run the game.