Well, some of us do play on a laptop or low-end desktop pc. And you know, common problems... FPS blablablablablablbalbal. So here is what I did to make my gaming experience a lot better on low-end pc. ( well I'm on mid-end tho )
1. run Rust with this launch option
-force-feature-level-9-3 -high -force-driver-type-warp
* note that you may remove the warp if your pc cant support it. you can also put "-nolog" but meh, no log means no support if you got crashed a lot. log is important.

2. slide the render thingy in Rust all the way to the left
3. go to \Steam\SteamApps\common\rust\cfg and edit the client.cfg file ( below ). So, each time you run Rust, you dont have to press F1 and type again and again and again.
grass.on Falsegrass.forceredraw False
grass.displacement False
grass.shadowcast False
grass.shadowreceive False
gfx.ssaa False
gfx.bloom False
gfx.ssao False
censor.nudity False
*bonus auto nude
Ok that's it. FPS still low? it's time to get a new computer.
p.s: idk if someone else already post this or not. just sharing.