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BarcodeDetector (currently) has pretty poor performance. I'm sure that will eventually be fixed, though. I've had great success with qr-scanner and a web worker, though....

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The wasm-based polyfill I posted works great for me, I use a <video> element to continously scan for QR codes (didn't test with other barcodes, but it is supported by the polyfill). Currently sampling 4 times per second (every 250ms) and it feels no different than a native scanner on the same device.

Edit: Just updated my post with the codepen from the polyfill author: https://codepen.io/undecaf/pen/LYzXXzg

It is butter smooth with EAN barcode when using the builtin webcam on my Macbook (720p on a 2019 MBP16)

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