Gotcha, yeah clearing the cache / local data will do that :/ I believe that Safari has fairly strict per-tab memory limits, which is probably why you hit this. My computer also has 48 GB of RAM, which honestly should be way way more than is needed. I'd also be curious to know, were you uploading inlay images? A large image upload could potentially use more memory than I am anticipating, so perhaps that has something to do with it.