Fly.io unveiled Sprites, a new class of ultra‑light Linux virtual machines that appear in seconds. Each instance grants root access, carries a 100 GB durable root filesystem, and automatically sleeps when idle, driving cost to near zero. By treating a VM like a disposable pen, developers can spin up workspaces instantly.

The breakthrough rests on three engineering choices. First, Sprites discard user‑facing container images, launching from a single pre‑loaded container so creation mirrors a simple start command. Second, they store state on object storage—specifically an S3‑compatible backend—using a JuiceFS‑style chunk layout cached on local NVMe. Third, metadata lives in Litestream, enabling rapid checkpoint and restore.

Compared with Fly’s existing Fly Machines, which rely on OCI containers and attached NVMe volumes, Sprites offer true instant provisioning and effortless migration because their durable state is a URL rather than a tied‑to‑hardware disk. Observers will watch whether this model reshapes serverless workloads and prompts other providers to rethink VM spin‑up latency.