Monorepos, which consolidate multiple projects into a single repository, are gaining popularity due to their ability to streamline development processes, simplify dependency management, and ensure consistency across shared tools and libraries. Despite their benefits, scaling monorepos can be challenging as they grow in size and complexity, often requiring sophisticated build systems to maintain efficiency. High-performance build systems like Nx and Turborepo address these challenges by creating dependency trees, utilizing caching, and executing parallel jobs to optimize the build process. While Nx offers extensive features and community support, Turborepo provides a minimalistic approach with capabilities like remote caching. Both tools enhance the effectiveness of monorepos, making them more viable for large-scale development projects. Additionally, Earthly is highlighted as an open-source CI/CD framework that supports containerized and parallelized builds, offering a versatile solution for monorepo management.