Link Time Optimization (LTO)

Link Time Optimization (LTO) is a technique used by compilers to improve the performance and efficiency of software. Instead of optimizing individual parts of a program separately, LTO analyzes and optimizes the entire program at the final linking stage. This allows the compiler to see the complete code, identify redundancies, and make smarter decisions—such as inlining functions or removing unnecessary code—resulting in faster, smaller, and more efficient software. In short, LTO enhances how software is built by optimizing the whole system together, rather than just individual pieces in isolation.