What situation exactly? Tried the demo (https://joelseverin.github.io/linux-wasm/), seems to run fine. There isn't any benchmarking programs/scripts available inside of it, so can't really give out any numbers, but it doesn't seem to work worse than any other "Linux-in-a-browser-tab" I've tried earlier. Using a 5950x with Firefox on Linux 6.17.6-2 FWIW.