What is AOT and JIT in Java?

AOT compilation is one way of improving the performance of Java programs and in particular the startup time of the JVM . The JVM executes Java bytecode and compiles frequently executed code to native code. This is called Just-in-Time (JIT) Compilation.

Loading in AOT is much quicker than the JIT because it already has compiled your code at build time. JIT is more suitable for development mode. AOT is much suitable in the case of Production mode. Bundle size is higher compare to AOT.5 Kas 2020

AOT execution is faster to start than JIT execution , because the JIT has to compile the code as part of the execution.

AOT-compiled code is guaranteed to have fast startup and consistent runtime performance, with no latency during early runs. JIT-compiled code is slower at startup, but it can have better peak performance after it runs long enough for runtime optimizations to be applied.