Polymarket new trading system Nex open sandbox testing, scheduled to launch in mid-December

Josh, the Vice President of Engineering for DeFi at Polymarket, announced on platform X that the new trading system Nex, rewritten in Rust, has opened for sandbox testing. The system has mirrored production orders in shadow mode over the past week to verify latency, load stability, and matching accuracy, and has not officially launched yet.

The disclosed internal testing data shows that the order placement latency P99 has decreased from 1.55 seconds with the existing Central Limit Order Book (CLOB) to 3.76 milliseconds, but this metric does not represent end-to-end latency. The team plans to conduct 4 weeks of shadow testing, and if it runs well, it is expected to launch in mid-December; WebSocket improvements may be released earlier.