that is problem when you are using directx9 (dx9) (btw, its default).

use -vulkan, -dx11, or -opengl on launch options.

some says they are good with -vulkan api. but im better with -dx11.

basically use this link guide how to fix the problem.

http://www.geekcosmos.com/what-is-vulkan-h...e-it-on-dota-2/

"7. In the dialogue box that follows, enter “-Vulkan“, remove “-dx9”, “-dx11” or “-gl” from any existing launch options you may have and click OK."

try it out one by one, which one do you prefer.

another one, if you keep changing account on same pc, you need to set it again launch options.

good luck to you