I am also having the same issue. I have tried enabling Faster Docker Volumes, IPV6 setting, restarting VM, restarting computer, completely uninstalling and reinstalling Local. I do not have Avast. I have also tried re-importing sites. Checking on the directory where the files are saved, ensuring the paths match.
Is incredibly show and seems to actually just be getting slower, initially it was about a 2-3 second page reload, and now its more like 15-60 secs to load a page. Its painful process to work with, I love this program and have used it for sometime now, but its become unbearable to use right now, as it just feels like my work flow is stunted by waiting 