Optimization is the process of improving an existing program to make it work more efficiently or/and using less resources.

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What optimizations are premature? [duplicate]

I've been here for nearly a month and it seems that people have a tendency to be eager to use the "Premature Optimization is the root of all evil" argument as soon as someone mentions efficiency. ...
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Is premature optimization really the root of all evil?

A colleague of mine today committed a class called ThreadLocalFormat, which basically moved instances of Java Format classes into a thread local, since they are not thread safe and "relatively ...