In-case you don't know what it is, DLSS stands for Deep Learning Super Sampling, and it's exclusive technology to the Turing NVidia GPUs. The way it works is by using deep neural network learning technology to "intelligently combine details from multiple frames to construct a higher-quality final image" - in other words, it's better graphics with even better performance. Witchcraft, I know.
The good news is, if you happen to have a 20xx series card and enjoy Monster Hunter: World, then the technology is coming to that game very soon, July 17th in fact.
According to NVidia, you'll be able to get upwards of 50% improvement in performance in 4K, depending on the card, with the 2080Ti leaping from 48.7fps to 71.6fps on average, running at 4K max settings - although your mileage may vary.
As you can see, the performance improvement is substantial. It'll benefit everyone, 4K or not, but of course this is an extreme scenario with a very powerful processor and 32GB of ram (presumably so these tests have no bottlenecking) - even on the RTX 2060 the 4K performance becomes a much more acceptable proposition.
You'll need the latest drivers too, which you can grab now before the update drops, but the game update to enable the feature will be coming on July 17th.