Representatives of FromSoftware studio warned gamers that third-party software for mice can cause FPS sags while playing Elden Ring.
Earlier in the network there were many complaints from players about the fact that with the release of the Shadow of the Erdtree expansion, the performance level of the title has dropped significantly. The developers decided to respond, saying that, in their opinion, the joints are not in the game itself, but in the running software.
That's an interesting response. Try to check it if you play on PC and experience performance problems in Elden Ring.