Thanks, so i don't know what the issue is exactly but i have firefox as my default browser and it runs fine here, i tried it on chrome to see if i had the same issues as you did, and appartently for some reason i get the same thing where the sound is horrible : o like it's struggling but weirdly enough the game seems to run at normal speed.
I have no idea what causes this or how to fix that :/ so the best i could say for now is if you can/have another browser try it there and it should run fine, at least firefox which i tried, gonna try opera if it runs fine, and i have no idea or way to test on safari since i don't have an apple device so fingers crossed that this works fine here too ?
Sorry for the inconvenience, and thanks for bug report i did not expect that with the sound, especially since i never had this with past entries.