Thanks for the kind comments. Sorry to hear about the crash, etc. We haven't gotten many reports about this; if you could file a bug report the next time (https://github.com/brownplt/pyret-lang/issues/new) we'd appreciate it! [But Firefox is _really problematic_ for various reasons. That may be half the issue.]

Pyret's compiler is actually written in Pyret itself, so that it can run entirely offline. Once you have the initial page (which could be offline), you can literally turn off all networking and continue to work forever. Of course, saving files is then a problem—but I actually do this when I'm on planes (I copy my code to another file to backup).

The _first_ load is indeed a bit of a problem. We're looking into various ways to reduce that. However, you should not have had delays on any subsequent runs. We have students in other universities, and even high schools, using it, so I don't think there's anything Brown-specific at work here. So I'm afraid it may be something to do with your particular laptop )-:.