Running out of disk space can cause all sort of issues, although I’m not sure any would affect performance. It can lead to difficulties with editing files, but not (in my experience) with the Editor not responding. Looking at your project it doesn’t seem likely to encounter disk space issues unless something out of the ordinary happens.
I’d be interested to know what your browser console looks like the next time you run into this problem. There are a few edge cases that can cause the Editor to get stuck like that but they don’t usually resolve themselves. If you see it again can you let us know if you see any errors in there?