Game is lagging a lot that to when it's a very basic game.

I started working on Unity3d days ago and started with the basic Roll-A-Ball tutorial . My PC can run heavy games like Battefield and Call of Duty Modern Warfare 3 even then it’s lagging the Roll-A-Ball game . I am sure it’s not the problem created by my PC . Help please .

Had the same problem. That Unity3D had a very bad performance, even for simple environments.

My solution:

Create a .bat file with the following content in the Unity/Editor folder:

Unity.exe -force-d3d9

That forces to use DX9 instead of DX11, which caused the problems on my Windows 10 PC.

I hope it helps in your situation.