But handling that stuff is slow. To calculate a string’s width it can’t call len on the string. Instead it has to pass every character through a state machine.
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Фото: Belkin Alexey / news.ru / Globallookpress.com
The script grabs the captured audio element, mutes it, sets playbackRate to 16 (the browser maximum), seeks to the beginning, and calls .play(). The browser, in its infinite eagerness to keep the buffer full ahead of the playback position, frantically fetches, decrypts, and feeds chunks into the SourceBuffer. Every single one of those chunks passes through the hooked appendBuffer and gets collected.