Newer versions of Java cache compiled classes. The startup time is maybe 10 seconds for something big running Java 11. You can also compile AOT for some perfor

Newer versions of Java cache compiled classes. The startup time is maybe 10 seconds for something big running Java 11. You can also compile AOT for some performance loss at runtime but zero startup time. Android has been doing this forever but you can also do it on a PC using Graal. And yes Java will destroy Erlang at concurrent connections if you use an async framework like Vert.X or fibers using Quasar/Comsat. It has lower per thread overhead than Erlang and runs code faster in general. Both Java and Erlang will max out Linux TCP connections before running out of steam so this is kinda academic though