Sandflare – I built a sandbox that launches AI agent VMs in ~300ms

Re:Sandflare – I built a sandbox that launches AI agent VMs ... by pasanhk on Tuesday March 31, 2026 @02:09AM (#47583347)

This is a killer niche. Integrated Postgres solves the biggest headache with ephemeral sandboxes—actually keeping the agent's memory. 300ms is already solid, but getting under 100ms usually means moving from "booting" to Firecracker Snapshots.

If you haven't yet, look into pre-warming TAP devices and bypassing the HTTP API for direct process management. Exciting stuff!

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Re:Sandflare – I built a sandbox that launches AI agent VMs ... by ajaysheoran2323 on Tuesday March 31, 2026 @02:19AM (#47583410)

Thanks! The snapshot approach is exactly what we're using — UFFD (userfaultfd) to restore from a pre-booted snapshot, with on-demand page faulting so the VM responds before all memory is loaded. That's how we get to ~300ms.

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