[Polymarket's New Trading System Nex Opens Sandbox Testing, Expected to Launch in Mid-December] Josh, VP of Engineering for DeFi at Polymarket, announced on the X platform that Nex, a new trading system rewritten in Rust, has opened its sandbox testing phase. The system has been mirroring production orders in shadow mode for the past week to verify latency, load stability, and matching accuracy, and has not yet been officially launched. Internal test data disclosed shows that the order 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 four weeks of shadow testing, and if it runs smoothly, it is expected to launch in mid-December; WebSocket improvements may be released earlier.