Unplayable FPS problems

As the title says when I launch Rust, I experience so heavy fps lag it is unplayable, I put everything on the lowest graphics and it still did no difference to me, anybody know a fix?
I am playing on a laptop, here are the specs:

i7-4700MQ CPU @ 2.40GHz
8 GB RAM
GTX 765m 2GB GDDR5
1 TB+128 GB SSD

really? I have a GTX 550, 4GB ram, and a i5-3450 @ 3.10Ghz, and I could run with full resolution, with the highest settings. Maybe its something to do with the games optimization?

Try to type these in the console (F1) : grass.displacement False , grass.on false

UR laptop is the problem. nice and easy solve:
right click on ur desktop, go to NVIDIA settings.
Add Rust and select High performance NVIDIA processor.
Laptops only got this function, If u got problems with fps in other games, try doing this for those cuz ur laptop is strong enough to play this game max resolutions and highest settings.
Example:

Please let us know if it works. This might help for other people aswel, plus else we could find another solution.