https://wccftech.com/nvidia-answers-burning-dlss-questions/

Earlier this week GeForce RTX owners had the chance to put their new and shiny graphics cards to the test with the release of Metro Exodus, which featured both ray tracing and deep learning super-sampling, as well as the Battlefield V update that added deep learning super-sampling to the game (it already had ray tracing).

The main purpose of deep learning super-sampling, or DLSS for short, has always been to help GeForce RTX cards deliver playable frame rates at high resolutions when coupled with the taxing ray tracing effects. So far, while there is indeed a performance boost upon activating it in both Metro Exodus and Battlefield V, there’s also a significant compromise to image quality which loses sharpness and definition with DLSS enabled.