Gtx 1080 lagging in Gta V

[straightkilla0]

Okay so my rig is:

Intel I7 8700K
Gigabyte Gtx 1080 Gaming G1
16GB DDR4 RAM
Samsung 860 evo SSD
Windows 10 Pro 64 bit

I'm trying to run Gta V on the highest settings on 1440p resolution.

According to this source I should be getting above 90fps:
http://www.userbenchmark.com/PCGame/FPS-Estimates-Grand-Theft-Auto-V/3727/137575.347462.Max.1440p.0
Other internet sources suggest similar performance.

But when I play the game I feel intense fps drops in environments with a lot of vegetation.
In the city the fps is usually smooth, but in country roads/forests it drops down to and stays at 20-30 fps (unplayable).

In task manager, I can see that my CPU isn't even crossing 50% usage, but my GPU immediately spikes to 100% and stays there as long as the game is unpaused.
I can hear my GPU fans working hard as soon as I unminimize the game window.

This is unusual because my GPU should be able to handle this game on max settings even in 4K.

My Nvidia drivers are up to date and my computer scores highly on benchmarks.

 

[schaft]

Yeah, your spec should kill the game. Just make sure you played it on fullscreen mode, not windowed. Windowed mode normally make the pc not fully optimal. See if it works

 

[straightkilla0]

Yeah, your spec should kill the game. Just make sure you played it on fullscreen mode, not windowed. Windowed mode normally make the pc not fully optimal. See if it works

I did run it on fullscreen mode. I always do.

 

[mdd1963]

Sounds like running default MS-provided drivers somewhere instead of properly installed chipset and/or GPU drivers...

 

[straightkilla0]

Sounds like running default MS-provided drivers somewhere instead of properly installed chipset and/or GPU drivers...

I'm definitely running the Nvidia drivers.
The default MS driver wouldn't even be able to launch this game...

 

[mahanddeem]

Grass on ultra and advanced graphics destroy performance (even on gtx1080). Turn these to high for grass and off for advanced settings.