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I've checked your site's code, you are using pre-recorded mp3 files. I guess the latency comes from the browser itself. Mine is generating the sound on demand, a webassembly program runs constant in the background. I used a special language for digital signal processing called Faust to make it - https://faust.grame.fr/ It has an export function that renders a working page that I just styled and added the virtual and pc keyboard code to it.
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Hence, a higher number means a more popular project.