[js8]

> What I really don’t understand is that Java is such a fast language but large enterprise web server applications written in Java always feel so slow in user experience in production. It just feels like something from the late 90s.

My personal suspicion is that the programming style used in Java (OOP and patterns) together with the fact that everything is a reference, and everything is implemented in Java itself way down, kills the cache locality, which is the thing that makes modern computers fast.

Yes, you can write fast Java programs, if you keep abstractions to a minimum, use arrays rather than objects when allocating, and take advantage of the JIT compiler. But these are more lab conditions (which are great for benchmarks) rather than the real world conditions. I think finally having a proper record type in Java will help to fix this.