Nintendo announced that the Pokémon Scarlet and Violet Version 1.1.0 was posted online on December 1st, 2022. They also confirmed the games' performance issues and stated they are working on improving it, hopefully in a future patch. Our Pokémon Scarlet and Violet Patches page has been updated with the latest details.

Ver. 1.1.0 (Released December 1, 2022)

• Season 1 of Ranked Battles will kick off, allowing you to enjoy Ranked Battles through the Battle Stadium.
  • Please check the in-game notice for more details about Ranked Battles Season 1.
• An issue has been fixed that caused the music to not play correctly during the battles with the Elite Four and the Top Champion in the Victory Road path.
• Other select bug fixes have been made.

We are aware that players may encounter issues that affect the games' performance. Our goal is always to give players a positive experience with our games, and we apologize for the inconvenience. We take the feedback from players seriously and are working on improvements to the games.

Source: https://en-americas-support.nintendo.com/app/answers/detail/a_id/60277/p/989