Why do we need to optimize the code?

Code optimization is any method of code modification to improve code quality and efficiency. A program may be optimized so that it becomes a smaller size, consumes less memory, executes more rapidly, or performs fewer input/output operations.

What is peephole optimization example?

Peephole optimization is an optimization technique performed on a small set of compiler-generated instructions; the small set is known as the peephole or window. Peephole optimization involves changing the small set of instructions to an equivalent set that has better performance.

What are the various optimization techniques?

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Continuous Optimization.
Bound Constrained Optimization.
Constrained Optimization.
Derivative-Free Optimization.
Discrete Optimization.
Global Optimization.
Linear Programming.
Nondifferentiable Optimization.

How to speed up this code?

Know the basic data structures. As already mentioned here dicts and sets use hash tables so have O (1) lookup performance.

Reduce memory footprint. This is inefficient because a new string gets created upon each pass.

Use builtin functions and libraries.

Move calculations outside the loop.

Keep your code base small.

How to optimise this code?

but it is a good habit of writing optimized codes.

Avoid calculations in loop: We should avoid any calculation which is more or less constant in value.

Avoid pointer Dereference in loop: Pointer dereferencing creates lots of trouble in memory.

What is a compiler optimization?

Compiler optimization is generally implemented using a sequence of optimizing transformations, algorithms which take a program and transform it to produce a semantically equivalent output program that uses fewer resources and/or executes faster. It has been shown that some code optimization problems are NP-complete, or even undecidable.

Why do we need to optimize the code?