Daniel Lemire wrote in Performance tip: avoid unnecessary copies, comparing Bun to Node.js, about a particular case where copying data becomes expensive: It turns out that the copy was not happening as part of base64 decoding but in a completely separate function. There is an innocuous function in Node.js called StringBytes::Size which basically must provide an upper on the memory needed by the Buffer.from function. As shown in the benchmarks, in the piece, Node.js becomes much slower than...
