The article just says that SpeechAnalyzer size is "system." It actually treats each locale like an on-demand resource and Apple doesn't document how much space each one takes up or under what circumstances they get cleared.
In my own tests a few months ago, it was faster than both small/large Whisper models I compared it to with accuracy competitive with both of them (each model had different quirks).
In my own tests a few months ago, it was faster than both small/large Whisper models I compared it to with accuracy competitive with both of them (each model had different quirks).