Large or deeply nested types, along with redundant type checks, can slow down build times. Use tools like `tsc --diagnostics` to profile and optimize the build process.

As your TypeScript project grows, you might notice slower build times, especially with large or complex types. To diagnose this, you can use tsc --diagnostics to profile the build and see where time is being spent. Deeply nested types or complex generics can slow down the type-checking process, so simplifying your type definitions can help. You can also optimize your build by using skipLibCheck in your tsconfig.json to skip type-checking external libraries. For large projects, consider using tsc --build mode, which allows incremental builds to avoid recompiling the entire project every time. By profiling and optimizing your TypeScript setup, you can speed up build times and improve development productivity.