Perf: use fewer slices in while loop #1
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Should boost performance significantly for larger incoming buffers.
This fixes the issue for me at ipfs-inactive/js-ipfs-unixfs-engine#187
The way I implemented my test, a single buffer of 57621555 bytes comes in and gets split into ~220 blocks. By not slicing the remainder to a new buffer 219 times it saves a lot of buffer allocation churn to process a buffer as large as this.