Blockchain firm Aptos Labs has introduced MonoMove, a new execution engine designed to improve smart contract performance on the Aptos blockchain. According to the company, internal tests showed the system executing smart contracts up to 55 times faster than the network's current engine. Aptos expects MonoMove to reach feature completion by late 2026, with a mainnet rollout proposed for 2027.

Aptos Calls MonoMove Its Largest Scalability Upgrade

Announcing the upgrade in a post on X, Aptos described MonoMove as the biggest scalability upgrade proposed in the network's history. The company said the new execution engine is intended to support faster smart contract processing as more financial activity moves on-chain.

Introducing MonoMove, Aptos' new execution engine and the biggest scalability upgrade in network history. Moving global markets onchain takes a new standard of speed and safety. MonoMove delivers both, executing the smart contracts behind every onchain market up to 55x faster.… pic.twitter.com/qeAdL73Zfx

— Aptos (@Aptos) October 6, 2026

Smart contracts are blockchain-based programs that automatically carry out actions once predefined conditions are met. Depending on the application, they can process payments, match trades, or move without requiring each action to be handled manually. The execution engine is the part of a blockchain responsible for running that code as transactions are processed, which places it at the center of how quickly a network can handle activity from applications built on top of it.

As more financial activity moves on-chain, execution speed can affect how quickly applications process transactions and respond to changing market conditions. Aptos Labs claims MonoMove addresses that requirement by increasing the rate at which smart contract code can run. During internal testing, the engine executed smart contracts up to 55 times faster than Aptos' existing system, according to the company.

However, those figures reflect internal testing rather than independent benchmarks or performance recorded on the Aptos mainnet.

Runtime Checks and Differential Testing

Beyond speed, Aptos Labs is also focused on maintaining the asset protections built into the Move programming language, which was originally developed at Meta (then Facebook) for its Libra/Diem project. MonoMove retains Move's rules governing how digital assets are created, copied, and transferred, while introducing additional runtime checks. According to the announcement, those checks are designed to catch potential errors in the verifier or virtual machine before they affect transaction execution. As a result, the company expects the architecture to reduce exposure to certain classes of software bugs.

Testing will remain a key part of development before MonoMove reaches production. Aptos Labs is currently using differential testing, which runs identical workloads through both MonoMove and the existing execution engine. Developers can then compare the results from the two engines to identify discrepancies before the new system reaches mainnet. Aptos also plans to conduct formal verification of critical components as MonoMove approaches production readiness.

Mainnet Rollout Subject to Governance Vote

Although development is progressing, MonoMove is not yet running on the Aptos mainnet. Aptos Labs expects the engine to reach feature completeness by the end of 2026 before moving toward a proposed 2027 release.

Even after development is completed, mainnet activation will remain subject to an Aptos governance vote, the on-chain process through which holders of the network's APT token vote on proposed changes to the network. That means the proposed timeline could still change before the engine becomes part of the network. The milestones to watch between now and any activation include the completion of differential testing, formal verification of critical components, and the outcome of that vote.