This was discussed several times, and async audio sucked like a hell (in fact, it still sucks with Zelda uCode games running with DSP HLE). So, the long answer: if you don't have a computer capable of running Dolphin at full speed all time, the sound will stutter. If you're getting stuttering, your only choices is getting a faster computer or using OpenAL audio backend that provides timestretching (so, the sound will not stutter, even when running below 100%), however you'll get some audio latency.
If you're wondering why async audio was removed, you can read this article for more details.
And now the short answer: Async audio is inaccurate and buggy and will not come back.
If you're wondering why async audio was removed, you can read this article for more details.
And now the short answer: Async audio is inaccurate and buggy and will not come back.
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)