I'm a bit new to this stuff, so I'm not exactly sure to be honest! It looks like he is piping several array operations through Accelerate, and I suspect there is at least one part of my render callback function that would finish faster with appropriate vectorization.

If anyone has any relevant tips about how the Obj-C LLVM or whatever it is actually works and what it means for low-latency audio, please do share. My current strategy is ruthless and minimal static allocation but I don't know what is best.