1. No, it's the one thing that has to be on the main thread per spec. 2. It's true for all browsers. ScriptProcessor runs on the main thread and can be glitchi

1. No, it's the one thing that has to be on the main thread per spec. 2. It's true for all browsers. ScriptProcessor runs on the main thread and can be glitchier in Firefox (but depending on the use case it can be the opposite). See https://padenot.github.io/web-audio-perf/#scriptprocessornode https://padenot.github.io/web-audio-perf/#scriptprocessornod... for more details. 3. Worklets are bits or javascript that run on the audio thread directly, where you're supposed to only implement the DSP bits, and only communicate with the main thread using message passing.