MonoMove is Aptos Labs’ rebuilt execution engine for running Move smart-contract code. Aptos claims it can execute that code up to 55× faster; Aptos Labs says the headline result was achieved with parallelism still switched off. The claimed gain is a benchmark result, not a live mainnet upgrade: Aptos targets feature completeness by end-2026 and a 2027 rollout subject to a governance vote. Aptos Labs announcement · rollout timing
Aptos Labs also says MonoMove preserves Move’s asset rules and adds redundant checks in the verifier and VM; its Decibel workload tests reported up to 55× faster collateral withdrawals, while separate end-to-end simulations reached up to 11× throughput. Safety and testing claims · benchmark reporting
The public material here does not specify the engine’s low-level implementation changes or benchmark methodology.