> First of all, the difference between threads is not nearly as severe as the difference between (remote) machines The whole reason for Loom is to improve perf

> First of all, the difference between threads is not nearly as severe as the difference between (remote) machines The whole reason for Loom is to improve performance of code that would otherwise be blocking. So what code is blocking? Exactly: code that waits for the OS (files, network, etc.). A call from one thread to the other isn't really a blocking call and that is not really what project Loom's main focus is about - at least as far as I can tell.