Rust is not running in "True Fullscreen" (Hard Performance Hit / Inputlag)

[FatNoob]

Hello Guys!

Im new to this forum, so please correct me, if i violate any rule.
I play Rust since 4 weeks now and i realized a hard inputlag and hit on performance since day one. I tried so many things, but absolutly nothing is working for me. I don't know, what else i could do by now. The problem is definitly the "Borderless Window" Mode, in which Rust is running for me. Things like popups and the taskbar can overlap the game while it is running and active (the game), so it isn't "True Fullscreen".

I tried following things:
I reinstalled Rust (just to be sure)
I deleted a specific folder in Regedit (\HKEY_CURRENT_USER\System\GameConfigStore\Children\{Rust Folder})
I disabled the Fullscreen Optimization in Windows 10 globaly and manually for the .exe (RustClient.exe)
I started RustClient.exe as Administratior
I launched the game with the Launch Option "-window-mode exclusive"

Nothing of these "tips and tricks" i found in the web were working for me. Absolutely no effect at all unfortunately.

The following informations are things about my spec and os:
OS: Windows 10 Home Premium (64x)
Systemmodel: Predator G3-710
Bios: R01-A1
CPU: i7-6700 @ 3.40Ghz (8 CPUs)
Graphics: Nvidia GTX 1070
Latest Drivers

So.. because for nearly 99% of people, which tried the methods listed above are actually working, i'm pretty sure that this is a real thing (why wouldn't it?). So what could i do by this point? I provide you every information you need, but please, help me. I have a 60hz Monitor, so the inputlag is in Borderless Window really hard and really not a great thing.

(I'm from germany. If it isn't against the rules, you can answer my question in German too.)

[FatNoob]

Could someone try to help me? Is there maybe someone with the same problem? I'm lost. I bought the game and got nearly 500h and i never, really not a single time felt good in aiming against other people (and i have 80 - 120 FPS constantly). I would love it, if this game would be in Unreal Engine, but i know how stupid it is, just for a bunch of people, changing everything. As of today, i officialy hate Unity.

[Sosig.exe]

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