I think the biggest problem with SharedArrayBuffer is that you need to set the Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers for it to wor

I think the biggest problem with SharedArrayBuffer is that you need to set the Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers for it to work at all (due to Spectre), which means you need a host or a web server where you can configure that.