Judging by the pictuer you just sent me, you have The highest graphics settings on, You just simply have to turn shadows off, and the game will run a lot faster, To do this, Simply open up ROBLOX studio(You can find it in "all programs" Then, When it's opened, Go to "tools", Then "settings" And a pop up will come up, After that, It will have some network, rendering, authoring, diagnostics, and game options stuff, Go to Rendering, And turn shadows off.