Yep, typechecking performance will be drastically improved. Using the trace generator [0], I discovered tsc spent more than three seconds [1] to locate and parse all source files googleapis pulls in during type checking. Replacing it with the individual packages almost completely eliminated that overhead.

[0] https://github.com/microsoft/TypeScript/wiki/Performance#per... [1] https://user-images.githubusercontent.com/2109932/176479729-...