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Using devcontainers for TS dev brings performance challenges when mounted workspace is in mounted Windows folder and node_modules are not in devcontainer/WSL filesystem. Does anyone have experience with adding all required NPM packages to the devcontainer image and reference those from the Pulumi TS project in the workspace?

Are you using WSL1? I thought WSL2 solved all those performance issues.
Can you explain the environment in a bit more detail? Are you running Pulumi from containers in WSL2, and storing your shared files on a Windows filesystem? Or are the shared files in WSL2? Are you using podman, Docker Desktop, something else?

I have in the past run Pulumi from Docker in WSL2, with bind-mounts from the containers to the WSL filesystem. That never showed any performance issues.