This is about the second time someone was willing to pay me money (try to) make their audio DSP "go faster". Which is a terribly shitty task.
Render a full track in a DAW time how long it takes. That's how long it takes in the industry. If you're asking for it to be faster than that for your stupid music app without sacrificing quality, that's a big ask I probably won't be able to do, and you couldn't afford it even if I could.