Many client-specific interfaces are better than one general-purpose interface.

Software entities should be open for extension, but closed for modification.

A class should have only a single responsibility - that is, only changes to one part of the software's specification should be able to affect the specification of the class.

Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

You can deliver a faster startup time, especially in big applications where much code executes on startup.

You have a slow processor.

You have little memory and disk space

The JIT compiler does not have to do a lot of disk I/O actions, which are quite expensive.