REG2012: Disabling dlss makes the game unplayable because it becomes a slide show. Less than 10fps. Even as low as 4fps lol. It needs optimization badly.
Gersen: If you disable DLSS you need also to disable ray tracing and lower of the details, of course depending of your resolution.
The thing with DLSS is that it's a "cheat", as in, it lower the rendering resolution to have a decent frame rate and then scale up the picture to your actual resolution. So if you system is not powerful enough for the graphical option you selected then it will need to lower even more the rendering resolution resulting in even blurrier image.
So if, without DLSS you end up at 4fps, I would say you definitely need to lower some graphics settings otherwise DLSS will need to really lower your rendering resolution, as in 720 or lower, to try to catch up and give you a decent FPS.
I don't think you can run DLSS at 1080p can you? I thought the minimum resolution for running it was 1440p because at 1440p DLSS renders the game at 1080p then upscales back to 1440p. At 4K it renders at 1440p then upscales to 4K. I remember when RTX first released, Nvidia had DLSS blocked from being enabled if you were using a 1080p monitor because there was no point in using DLSS at that resolution because the result would be worse than just running the game at a 720p native resolution anyway. DLSS relies on machine learning to upscale the images being processed. Naturally, the more data it has to work with, the better it is able to upscale with less loss of detail. I think that's why Nvidia originally disabled DLSS at 1080p. They probably considered 1440p with 1080p original render as the minimum viable resolution for practical reliable upscaling. Plus it's not like anything struggles with 1080p any more. Even budget cards these days have no trouble with full 1080p gaming with high settings.
To be honest, at 1440p the DLSS results are pretty terrible anyway. I don't really see a point in using it unless you're using a 4K monitor (upscaling from 1440p), but even then, I tend to just prefer disabling ray tracing if the game can't cope with RTX on without DLSS. Global illumination is plenty good enough until ray tracing becomes more reliable. And even at 4K in a non RTX game that supports DLSS, I tend to get better performance results at far better quality without the blur by simply adjusting the good old traditional settings. Such as Anti-Aliasing, Shadows detail/size, and Ambient Occlusion being the big three that tend to offer the least benefit past the high setting but have the biggest impact on performance.