Seems likely MicroPython will land here

So let's try that for perf testing.

Author: microbit-matt-hillsdon

src/mpconfigport.h

@@ -129,6 +129,7 @@ extern uint32_t rng_generate_random_word(void);
     ((mp_raise_NotImplementedError(MP_ERROR_TEXT("simulator limitation: asm_thumb code"))), p)
 
 // The latency of fetching 32 byte audio frames is too much so increase the size
-#define AUDIO_OUTPUT_BUFFER_SIZE (64)
+// 128 matches the web audio internal buffer sizes
+#define AUDIO_OUTPUT_BUFFER_SIZE (128)
 
 #endif