slows down after opening the menu. "Castlevania: Harmony of Dissonance"

[KippeiAsakura]

Issue:

Pressing the Start button to open the menu and then canceling and returning to the game slows down the game. When I use the debug tool to view the fps, it appears as if I am getting 60 fps even when it is slowing down. It is the same when running on Windows or in Safari on iOS.

My System: Ryzen3 3300X GeForce 1650super 16GB DDR4-3200 Windows11 22H2