[Polymarket Opens Sandbox Testing for New Trading System Nex] According to TechFlow, on November 13th, Josh, Head of DeFi Engineering at Polymarket, disclosed that the platform's Nex trading system, rewritten in Rust, has opened sandbox testing. The team plans to conduct four weeks of shadow testing with production traffic, and if all goes well, it is expected to launch in mid-December. Josh stated that Nex has been running in parallel with the existing trading system for the past week, mirroring production orders to test latency, load stability, and matching accuracy. In internal testing, the order placement time (P99) decreased from 1.55 seconds on the existing central limit order book to 3.76 milliseconds; this figure does not include end-to-end latency. The team has also rewritten WebSocket in Rust, and related improvements may be rolled out before the full trading system goes live.