Any chance of proper full screen? Framerate drops until I alt+tab

Rien · January 21

So, I recently built a new gaming PC along with a gsync monitor. This monitor has a refresh rate overlay option I use to monitor if gsync is working.
Now, for gsync to function in Subnautica I have to enable gsync support for windowed applications, it doesn't work for full screen only. I've taken this to mean that Subnautica DOES NOT do proper full screen.
Is this a problem? Well it shouldn't be, but here is the problem I'm having:
Randomly while I'm playing the framerate will drop from a pretty steady 70-80fps (Ryzen 1700 + gtx1080) to around 20fps. While this happens, I'm watching the GPU usage (using Rivatuner and Afterburner) drop from the usual high 90% down to about 20%. This will continue until I alt+tab out of the game, then switch back. When I do this, the framerate immediately jumps back up to normal.
I'm almost certain this is linked to the fact Subnautica doesn't run in proper full screen but I could be wrong.
If anyone has any input it would be greatly appreciated!

Thanks!

Edit: fixed title

ElKameleon · January 23

add this to your steam launch parameters for the game: -window-mode exclusive

This will net you some extra frames by enabling "true" fullscreen support.

Rien · January 24

ElKameleon wrote: »

add this to your steam launch parameters for the game: -window-mode exclusive

This will net you some extra frames by enabling "true" fullscreen support.

Damn, cheers man! Not only did that fix the FPS/GPU usage, I got 10-15 extra FPS and my gameplay is smoother overall!

Why on earth is exclusive fullscreen not the default state?! What a bizarre decision

Dreckar · January 24

ElKameleon wrote: »

add this to your steam launch parameters for the game: -window-mode exclusive

This will net you some extra frames by enabling "true" fullscreen support.

Thank you for sharing this tip

Racer1 · January 24

This situation is actually a side-effect of a bug in Unity 5.3, which made true fullscreen not work properly. As a result, UWE disabled it. Since UWE moved to Unity 5.6.x in Jul 2017, this should have been fixed. However, I suspect the 1.0 release crunch caused this option to just be lost in the mix.

Given that UWE has said they may do some enhancements post-1.0 (contingent on Subnautica popularity), I think it likely UWE will add this feature back in if there is enough interest.

Rien · January 24

Racer1 wrote: »

This situation is actually a side-effect of a bug in Unity 5.3, which made true fullscreen not work properly. As a result, UWE disabled it. Since UWE moved to Unity 5.6.x in Jul 2017, this should have been fixed. However, I suspect the 1.0 release crunch caused this option to just be lost in the mix.

Given that UWE has said they may do some enhancements post-1.0 (contingent on Subnautica popularity), I think it likely UWE will add this feature back in if there is enough interest.

Ah cool, didn't realise it was a technical issue. Hopefully it will get changed, the weird performance drops don't make a great first impression.
Glad the game's running perfectly for me now though, thanks for your input guys

DC_Darkling · January 24

I actually have the same issue on my gsync monitor but was to lazy (read busy) to go look for that variable.

As a side note, i suspect SN is a bit more CPU heavy then some may assume.
I shall come back to this in the future.

MrBlue7 · January 27

Hopefully this is fixed soon. I commonly have VLC playing something on my second monitor and the video gets really choppy as soon as I load up the game. It's *extremely* rare for this to happen - probably less than 1 in 100 games in my experience.

Any chance of proper full screen? Framerate drops until I alt+tab

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