[rdtsc]

One of the main points of Erlang is fault tolerance. Everyone forgets about that and talks actors and scalability, which is fine. But without fault tolerance and proceses with isolated heaps it doesn't matter how fast the C code is, it can process millions of transaction a second, and then segfault, and the availability and transaction rate goes to 0 on that node.

The other advantage is power of abstraction. With Erlang it is easy to describe and program distributed system with lots concurrent components. Sure you can do it with C++, Java, and Node.js etc, but those things are awkward there -- either threads share memory and have to deal mutexes, or you in are in callback/promise hell.