Does it make Matrix "proprietary" or "silo"? Did the IRCv3 WG have any results in 2015?
ojs@MacBook-Pro-4 /tmp % time ./a.out
Hello world
./a.out 0.00s user 0.00s system 1% cpu 0.268 total
ojs@MacBook-Pro-4 /tmp % time ./a.out
Hello world
./a.out 0.00s user 0.00s system 72% cpu 0.004 total
It's really that slow on first try. The binary was compiled just before running it, and it's the simplest possible hello world using C++ std::cout, compiled with -O3. C version with puts behaves just the same.