You're referring to the update 1.6.0 for The Legend of Zelda: Breath of the Wild!
: This update introduced a "boost mode" that increases the Switch CPU's clock speed during loading screens. Tests show loading times are approximately 26% faster compared to previous versions. System Improvements : Updated actor metadata and UI/message layouts specifically for the VR interface. www.thumbsticks.com Technical "Extra Quality" Enhancements
Official update 1.6.0 (released April 25, 2019) was primarily designed to add Nintendo Labo VR Kit support and significantly improve loading times. Key Features of Update 1.6.0
Modders discovered that the optimizations made for VR actually created a more stable environment for high-refresh-rate gaming. By building on the 1.6.0 architecture, the community perfected FPS++, a mod that allows the game to run at 60, 120, or even 240 FPS without breaking the game’s physics (which were originally tied to the frame rate). Why Fans are Returning to BotW in 2024/2025