Nexon is working to resolve several issues from beta tests, including frame drop issues for pre-download, partial distribution of beta test rewards, player movement issues in special operations, and client termination issues with certain antivirus programs1. They are also addressing problems with specific weapons, skills, and NPCs, as well as various display and item drop errors.
The main performance issues in The First Descendant include significant frame-rate drops across PC and console, stuttering issues, and lag. These problems have been reported by players since the game's launch, and Nexon is currently investigating and offering temporary solutions for some of the issues.
Nexon has acknowledged the frame-rate drop issues in The First Descendant and suggested a temporary workaround for players who pre-downloaded the game. They recommend deleting and reinstalling the game as a temporary solution while they continue to investigate the problem. However, players have reported mixed results with this fix, particularly on consoles.