Optimizing Vercel Sandbox snapshots (opens in new tab)

**Published:** April 2, 2026 | **Authors:** Tom Lienard, Rob Herley, Luke Phillips\-Sheard, Guðmundur Bjarni Ólafsson --- When we recently shipped filesystem snapshots in Vercel Sandbox to let teams capture and restore a sandbox's entire filesystem state, our initial engineering focus was entirely on reliability, making sure the system would never fail to snapshot or lose data. Once that foundation was stable, our attention turned to performance. p75 snapshot restores were taking over 40 s...