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TypeScript 5.6 and higher added functionality that will search for a `package.json` file for source files that are part of the program (e.g., `.d.ts`) and within a node modules directory. This can be an expensive tasks especially considering the large amount of `.d.ts` files within packages. TypeScript supports using a cache of known `package.json` files to improve the performance of this task. The Angular CLI will now provide and reuse this cache across rebuilds during watch mode. This includes the use of `ng serve`. The performance difference is most apparent for the Angular template diagnostic step of the build. Internally the Angular compiler creates a new template typechecking program which causes the `package.json` search process to occur. By leveraging the cache, this process becomes a series of cache hits. In the event that files are modified within the node modules directory, the cache is invalidated and the following rebuild may be longer as a result.