WebContainers resource utilization and client-side compute overhead

StackBlitz WebContainers shift the Node.js runtime from a remote server to the user's browser via WebAssembly. This architecture is designed to reduce backend infrastructure costs for low-traffic workloads by leveraging client-side compute.

While this removes the need for persistent virtual machine provisioning, the runtime's performance depends on the host's available system RAM and browser capabilities. Specifically, the use of SharedArrayBuffer requires strict Cross-Origin Opener Policy (COOP) and Cross-Origin Embedder Policy (COEP) headers to function correctly.

When deploying a project for a wide range of end-users, it is unclear how the environment handles resource exhaustion on low-spec client machines without impacting the stability of the browser tab.

• What are the specific memory thresholds that trigger runtime instability within a WebContainer?
• How does the environment manage memory pressure when installing large npm packages in a browser-based virtual file system?