There are fundamental language reasons why Java has a slow startup time. jar files do not contain native bytecode. Instead, they contain standardized, platfor

There are fundamental language reasons why Java has a slow startup time. jar files do not contain native bytecode. Instead, they contain standardized, platform-independent bytecode for the Java Virtual machine. What this means in practice is that when you start up, you have to convert all this Java bytecode to native bytecode. This is a CPU and IO-intensive operation. It would be a little like if the first thing your C++ program did was compile itself every time it was run! There are advantages to the way Java does things. You can distribute a single binary for multiple architectures, for example. However, it does have costs, and one of those is slow startup time.