Since the day I downloaded Necrodancer, I somehow have FPS fluctuations, or lag. I notice this the most of songs like Baboosh, especially medium level for some reason. I can literally see the fps drop and and the game starts lagging behind, and my inputs start registering early as the music is no longer in sync with what the game registers as the visuals start lagging behind the music. The ingame rythm bar on the bottom clearly shows the fluctuations, from late 'Great' to very early 'Ok''s. It seems to be mostly happening at the big skulls becoming smaller skelingtons, but not exclusive to.

First of all, I am extremely experienced with rythm games, and for 20 years I play stepmania (now etterna) daily, at insane+ levels (16 to 22 ish). I know when my timing or rythm is off, and playing Rift on medium is very easy to me and I have no problem's FC-ing any songs.

It drives me absolutely insane as I really really love the game since the very first beta, the songs are bangers and the new DLC's are fantastic. I spend so many hours trying to fix this to no avail.

Now the things I've tried, not a single thing or any combinations of things I've tried made it any better nor worse.

FramerateLimit to -1, 0, 60, 144, 165, 165.15 (my screens native refresh rate)

Vsync off/on

Gsync off/on

Running the game in admin mode, compatibility mode and all combinations of such

Literally unplugging second screen

Changing monitor FPS itself to 60, 144, 165, etc

HDMI/Display Port

DX11 parameter in steam

ShouldAllowBackgroundGameplay / ShouldPlayBackgroundAudio on or off, all combinations

Full screen / windowed mode / pretty much all resolutions

All and any accessibility and sound options on or off

Pretty much every single Nvidia option there is off or on, and pretty sure most combinations like vsync, openGL compatability, low latency mode, image scaling, max frame rate, you name it.

Various Nvidia drivers from up to 1 year ago to the latest

CPU is a K-model so can't test CPU graphics driver

Firewall exceptions

Reinstall of game, steam, both

No background tasks

Full reg-edit clean of the game

Logs on or off (literally pressed F1 to F12 once. restart game, repeat)

Changing audio drivers (though pretty sure it's a graphics/nvidia problem)

Changing audio devices, cabled, bluetooth and RF

Steam overlays, discord overlays, nvidia overlays on or off (mostly off)

Second keyboards

Checked a lot of reddit and steam discussion threads

PC Specs:

Z790

i7-13700KF

RTX 4080

32GB

m2 SDD 1TB (where the logs should theoretically go and where the game starts from)

Every other game, even other rythm games or unity games run perfectly fine, for some reason it's only Rift. Which is very unfortunate. I don't expect much, but Steam has many smart people. If not, i'll cut my losses :>