I think you are on Windows right? Please provide detailed system version (e.g. Ubuntu 24.04 or Windows 11 24H2)

If you are on Windows, can you try native DX? Is it smoother than DXVK? Can you use PresentMon to check presented FPS and latency?

Try making a file called dxvk.conf next to the exe and insert dxvk.allowFse = True

Try making a file called dxvk.conf next to the exe and insert dxvk.allowFse = True

I'm using FSE on GTA IV too, it's really amazing with VRR monitor, amazing update, so smooth !

I think you are on Windows right? Please provide detailed system version (e.g. Ubuntu 24.04 or Windows 11 24H2)

If you are on Windows, can you try native DX? Is it smoother than DXVK? Can you use PresentMon to check presented FPS and latency?

I'm running on Windows 11 Home 64-bit (10.0, Build 26100)
Using Presentmon, it's showing a consistent 60.0fps with a Frame Time Average of 16.7ms
However, I can physically see the frame drops in actual gameplay, despite them not being shown accordingly on Presentmon.
I don't believe I can update the regular DX version GTA IV uses as, without the installation of DXVK, GTA IV uses DirectX9 and isn't able to be updated. It also might be worth mentioning that GTA 4 is a 32-bit program so I'm using the 32-bit version of DXVK.

EDIT: I installed an older version of DXVK and it works fine. So maybe GTA IV is just incompatible with DXVK 2.5.3 for some reason? I installed 2.3.1 and it works.

Try making a file called dxvk.conf next to the exe and insert dxvk.allowFse = True

I thought that might fix it too, but unfortunately that didn't seem to make a difference.

I installed an older version of DXVK and it works fine.

Then it should be a regression issue.

Can you check logs to see whether your conf file enabled fse on 2.5.3? If the conf is recognized it should appear in logs. You may also try 2.5.1 as it's the last version with fse enabled by default.

If fse is working on 2.5.3 but still laggy, but 2.3.1 works well you may need to do a bisect to find from which version it is broken. Bisect is a method that always select the middle version between the first broken version you know and the last working version you know, until you find which version breaks things.

I installed an older version of DXVK and it works fine.

Then it should be a regression issue.

Can you check logs to see whether your conf file enabled fse on 2.5.3? If the conf is recognized it should appear in logs. You may also try 2.5.1 as it's the last version with fse enabled by default.

If fse is working on 2.5.3 but still laggy, but 2.3.1 works well you may need to do a bisect to find from which version it is broken. Bisect is a method that always select the middle version between the first broken version you know and the last working version you know, until you find which version breaks things.

2.5.1 works fine as well so I'm assuming FSE was the issue.

2.5.1 works fine as well so I'm assuming FSE was the issue.

Then seems your conf for 2.5.3 is not recognized.
Ensure dxvk.allowFse = True is in dxvk.conf, launch with 2.5.3 then check log file to see whether it's in the log. If it's not in log, then your location for dxvk.conf is wrong.

dxvk.conf should put in game working path (not always binary folder), the best way to find working path is find the location where dxvk generate logs.

I've made a special test version that enables fse for gta4. You may try this branch and see whether it works. If it works then that must be your configuration file is not recognized as expected. https://github.com/qinlili23333/dxvk/actions/runs/12822794747

Make sure that conf is the actual file extension/type. If you are creating the file first as a text document but File Explorer isn't set up to show the extension/file in the name then it might be actually be a dxvk.conf.txt.

An easy way to check if your dxvk.conf is read would be to add
dxvk.hud = fps to it.

Now when you start the game, there should be a text at the top left.

I noticed 2.5.2 and 2.5.3 versions don't like fps limiters, with 2.5.1 ver. I can set 60 fps limit in nvidia control panel on my 75hz monitor and no problems, but last two versions give me micro-stuttering in all games, the only solution is to disable fps limiter.

I noticed 2.5.2 and 2.5.3 versions don't like fps limiters, with 2.5.1 ver. I can set 60 fps limit in nvidia control panel on my 75hz monitor and no problems, but last two versions give me micro-stuttering in all games, the only solution is to disable fps limiter.

Are you using windowed mode or fullscreen? From 2.5.2 fullscreen behavior has changed. But if you use windowed mode it should be same.

I noticed 2.5.2 and 2.5.3 versions don't like fps limiters, with 2.5.1 ver. I can set 60 fps limit in nvidia control panel on my 75hz monitor and no problems, but last two versions give me micro-stuttering in all games, the only solution is to disable fps limiter.

Are you using windowed mode or fullscreen? From 2.5.2 fullscreen behavior has changed. But if you use windowed mode it should be same.

Fullscreen but not True Exclusive Fullscreen, Windows 11. You mean only windowed mode or should it work in borderless too?

Fullscreen but not True Exclusive Fullscreen, Windows 11. You mean only windowed mode or should it work in borderless too?

In 2.5.1, dxvk will use fse if the window size is same as screen, this is vulkan wsi on Windows default fse behavior. This means, borderless in game still may elevate to fse when dxvk is used. That's why borderless is suggested in game settings as dxvk can manage fse by its own.
In 2.5.2, fse is globally disabled in dxvk so no matter the game use which mode in settings it's windowed (may be borderless).
In 2.5.3, the default mode is same as 2.5.2, but you can use conf file to return to 2.5.1 behavior.

In windowed mode including borderless, all content is composed by dwm, which adds latency.
In fse, all content is directly sent to display without any compositor which minimize latency.
PS; Fullscreen optimization since Windows 10 is not applicable for vulkan wsi without dxgi swapchain.

Fullscreen but not True Exclusive Fullscreen, Windows 11. You mean only windowed mode or should it work in borderless too?

In 2.5.1, dxvk will use fse if the window size is same as screen, this is vulkan wsi on Windows default fse behavior. This means, borderless in game still may elevate to fse when dxvk is used. That's why borderless is suggested in game settings as dxvk can manage fse by its own. In 2.5.2, fse is globally disabled in dxvk so no matter the game use which mode in settings it's windowed (may be borderless). In 2.5.3, the default mode is same as 2.5.2, but you can use conf file to return to 2.5.1 behavior.

In windowed mode including borderless, all content is composed by dwm, which adds latency. In fse, all content is directly sent to display without any compositor which minimize latency. PS; Fullscreen optimization since Windows 10 is not applicable for vulkan wsi without dxgi swapchain.

Many thanks for information, could you please tell me what I need to write in dxvk.conf to make it work like before?

could you please tell me what I need to write in dxvk.conf to make it work like before?

dxvk.allowFse = True

Read more in default conf file:
https://github.com/doitsujin/dxvk/blob/c52a68a5be852481a69809f3668a6964b37e4e14/dxvk.conf#L30

@DatArtichokeDoe Friendly ping. Any update on this? Have you been able to verify that the config is applied correctly?

Hello, having the same issue even with dxvk.allowFse = True. My monitor reports 60hz while the game will run at 180fps. This issue does not occur if I disable G-Sync, and this issue will happen in other games I use DXVK with like Black Mesa and Resident Evil 6.

@RGB00255

My monitor reports 60hz while the game will run at 180fps

Enable VSync.

Enabling vsync through the NVIDIA control panel and directly in GTAIV doesn't help.

That's almost certainly not a DXVK issue then.

Yeah my guess now is that it is a driver issue because, upon further testing, this issue still occurs in Black Mesa's D3D9 mode in borderless fullscreen. Thank you for the response.