Show HN: We built a <60ms, open-source alternative to E2B using RustVMM and KVM

Tencent Cloud has open-sourced CubeSandbox, a secure sandbox service built with RustVMM and KVM. It offers sub-60ms cold starts, under 5MB memory footprint per instance, and kernel-level isolation for AI agents. The project is production-ready and compatible with E2B SDK.