DLSS, or deep learning super sampling, is NVIDIA's upscaling technology enabled by NVIDIA's line of RTX graphic cards. DLSS is an extension of NVIDIA's ray-tracing support on their modern GPUs usually paired together with ray-tracing features to increase performance without sacrificing visual fidelity.
Does Minecraft Java Have DLSS?
More and more games are receiving DLSS support, especially the most popular games out right now, and this includes Minecraft, except not all versions of Minecraft. Minecraft for Windows 10 or Minecraft Bedrock or simply Minecraft is the edition of the game that supports both DLSS and ray-tracing on NVIDIA RTX GPUs. Minecraft Java does not support these features.
Though, if Minecraft one day gets a next-gen upgrade, it's possible new and improved rendering tech will come to the game, too. Unfortunately, this is pretty unlikely to happen.
However, Minecraft Java does have much better mod support than other versions of Minecraft that can bring similar functionality to the game. Mods like OptiFine or Sodium will massively increase your performance in Minecraft Java without any hit to image quality. And OptiFine supports shaders, mods that overhaul the look and feel of Minecraft by adding visual upgrades like shadows, volumetrics, dynamic lighting, particle effects, and much more.
How to Increase FPS and Get Ray-Tracing in Minecraft Java
For OptiFine specifically, there are even shader projects out there being built that support ray-tracing independent of NVIDIA RTX GPUs. SEUS PGTI is a branch of the popular SEUS shader that's in an alpha state right now but aims to bring full ray-tracing to Minecraft Java. Though, for both now and in the future, it's unlikely ray-tracing shaders for Minecraft Java will ever run as well as NVIDIA's offerings.
While Mojang does not like to split the Minecraft community with specialty features that only appear on a specific edition or platform, Minecraft Java runs in Java, an old coding language that's nowhere near as performant and efficient as modern coding languages like C++ which Minecraft (not Minecraft Java) was built with.
Accordingly, fancy modern features like DLSS and ray-tracing are infinitely easier to support in Minecraft, while implementing them in Minecraft Java would significantly impact the performance of the game unmodded. So, it's unlikely we'll ever see official DLSS or ray-tracing support in Minecraft Java.