[Python] Fast concatenation of bytes() in python3

I have an array of byte-strings in python3 (it's an audio chunks). I want to make one big byte-string from it. Simple implementation is kind of slow. How to do it better?

chunks = []
while not audio.ends():
chunks.append( bytes(audio.next_buffer()) )
do_some_chunk_processing()

all_audio=b''
for ch in chunks:
all_audio += ch


How to do it faster?

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