Ivy Renderer is Angular's next-generation compilation and rendering pipeline, introduced as the default engine starting from Angular version 9. It represents a significant overhaul of the previous rendering engine, aiming to optimize both development and runtime performance through various technical improvements.
Key Features of Ivy Renderer
Tree Shaking: Ivy is designed with tree shaking in mind, which means it only includes the code that is actually used in the final bundle. This results in smaller bundle sizes, as unused code is effectively removed during the build process[8][9].
Incremental DOM: Unlike the previous Virtual DOM approach, Ivy uses Incremental DOM. This method updates the DOM incrementally, only modifying parts of the DOM that have changed, rather than rebuilding the entire DOM tree. This leads to reduced memory usage and faster updates[2][7].
Locality: Ivy compiles each component independently using only its local information without requiring knowledge of the entire application. This locality principle speeds up the compilation process, makes the build process faster, and simplifies dynamic component loading[8][11].
Improved Debugging: With Ivy, the generated code is more readable and closer to the source code, which simplifies debugging. Developers can more easily trace through the code and understand how templates are being rendered[16].
Backward Compatibility: Ivy maintains backward compatibility with older versions of Angular, allowing developers to upgrade existing projects without significant changes. It also supports advanced features like lazy loading of components without the need for Angular modules[10][12].
Faster Testing: The testing environment benefits from the locality and tree shaking features, resulting in faster test execution times[16].
Performance and Optimization
Ivy's architecture not only reduces the initial load time of Angular applications by decreasing the size of bundles but also enhances runtime performance through efficient change detection and rendering updates. The use of Incremental DOM m...
