REAL - REduce Audio Latency
Huge shoutout to sol_azul on reddit for pointing out the part of Windows Audio Engine documentation that made this possible.
What does this do?
As the title implies, this application reduces perceived delay between a keypress and the audio feedback. The application is not limited to osu! but also works on the vast majority of other games and programs running on Windows 10.
My 40.3ms average delay in osu! dropped down to 31ms after installing Windows HDAudio driver and enabling low latency mode with REAL, but your mileage may wary.
To achieve the best results please follow the setup instructions.