RUST Render Texture Create failed : format unsupported

Hello, can some one help to fix this Render Texture Create failed : format unsupported. I think this bug makes me so much lag.

hit f1 and type grass.displacement false answer courtesy of Helk http://www.facepunch.com/showthread.php?t=1332714

But it still laggy, can you tell me how to fix?

grass.on false is another that may help by taking a bit of rendering load off of your gpu? try it and post if it makes a difference. Oh and when you start the game make sure you select fastest and not fantastic and drop the resolution a bit they will also help .

I think it increase little bit of fps.

Also found this. cant verify but ive seen others who could.
Right click rust in steam, go to properties -> set launch option and type this:

-force-feature-level-9-3
-nolog
-force-feature-level-11-0
-high

thx physco, this fixed my Render Texture Create failed : format unsupported issue