# Polymarket Targets Mid-December Nex Launch as Tests Cut Latency to 3.76 Milliseconds

By Simon Yoon

Canonical URL: https://www.tokenpost.com/news/technology/56813
Published: 2026-11-13T15:10:19.000Z
Updated: 2026-11-13T15:10:19.000Z
Section: Technology

> The engine has run against production traffic in shadow mode for one week. Polymarket plans four more weeks of testing before a possible launch.

Polymarket is targeting a mid-December launch for Nex, a Rust-based matching engine, after internal tests showed p99 order latency falling from 1.55 seconds to 3.76 milliseconds, Polymarket Engineering Vice President Josh Stevens said.

Nex has run in shadow mode against production traffic for one week. Stevens said Polymarket plans to keep it there for four more weeks, with a mid-December launch planned if testing goes well.

Stevens said p99 cancel latency fell from 627.92 milliseconds to 3.20 milliseconds. P99 WebSocket write latency dropped from a prior range of 44.5 to 88.1 milliseconds to 0.099 milliseconds.

Nex can process 100,000 instructions per second, compared with 10,000 for the existing system in steady state, and can reach a peak of 150,000 per second. Startup time fell from five minutes to 15 seconds.

Nex makes no breaking changes to request and response formats for market makers and developers. Polymarket has opened a Nex sandbox for user testing, and WebSocket improvements may roll out before the full engine.