Builds the app and runs the resulting code to profile the server startup time, watching for changes. This command can be used to [debug slow app startup times](/docs/custom-storefronts/hydrogen/debugging/cpu-startup) that cause failed deployments in Oxygen. The profiling results are written to a `.cpuprofile` file that can be viewed with certain tools such as [Flame Chart Visualizer for Visual Studio Code](https://marketplace.visualstudio.com/items?itemName=ms-vscode.vscode-js-profile-flame).
shopify hydrogen debug cpu [flags]The following flags are available for the `hydrogen debug cpu` command:
env: SHOPIFY_HYDROGEN_FLAG_ENTRY
Entry file for the worker. Defaults to `./server`.
Specify a path to generate the profile file. Defaults to "startup.cpuprofile".
env: SHOPIFY_HYDROGEN_FLAG_PATH
The path to the directory of the Hydrogen storefront. Defaults to the current directory where the command is run.