Polymarket has opened a sandbox testing environment for its new trading engine codenamed Nex. Rewritten in the Rust programming language, the system is designed to replace its legacy central limit order book (CLOB). Josh Stevens, VP of Engineering for DeFi at Polymarket, announced the upgrade to address issues in the legacy system, which frequently faced race conditions and inconsistent behavior when transaction volumes surged.
What sets Nex apart is not just the programming language, but the massive leap in under-the-hood performance metrics.
How Fast the New Engine Operates
Under steady conditions, Nex boasts a processing throughput of 100,000 orders per second and can accommodate up to 150,000 orders during transaction surges. That capacity represents a tenfold increase over the legacy CLOB system’s limits, which stood at 10,000 orders under steady conditions and 15,000 during surges. Beyond order capacity, initial system initialization or boot time has dropped from 5 minutes to just 15 seconds.
Execution speed improvements are especially evident in p99 percentile latency records, the benchmark where 99% of transactions are fully processed. Order placement latency dropped from 1.55 seconds on the legacy system to 3.76 milliseconds on Nex, or roughly 412 times faster. At the p95 percentile, order placement is completed in 1.59 milliseconds, far outperforming the legacy system’s 341.84 milliseconds.
Latency was also drastically reduced in order cancellation processes. Order cancellation time at the p99 level dropped from 627.92 milliseconds to 3.20 milliseconds, while market order cancellations fell from 810.16 milliseconds to 5.14 milliseconds. At the p95 level, order cancellations are finalized in 1.58 milliseconds.
Data Refresh Without Altering API Formats
Market data updates also underwent an architectural overhaul. The Rust-based WebSocket service tasked with updating order books and prices recorded a p99 write latency of 0.099 milliseconds. This marks a massive improvement from the legacy system, which required between 44.5 and 88.1 milliseconds for the same task.
Despite overhauling the engine down to its foundational code, external integrations remain uninterrupted. Stevens added that the new architecture does not alter API request or response formats for market makers or application developers.
One-Month Testing Ahead of Phased Rollout
Before the sandbox opened to the public, Nex underwent parallel testing, or shadow operations, alongside the production exchange for a week to match every real order. Polymarket plans for testing to run for four weeks before deciding on a phased rollout schedule in mid-December 2026.
For market participants who rely on speed, this upgrade provides millisecond execution certainty during trading surges - without requiring any changes to their existing bot code.
Reported by crypto.news.
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Disclaimer: This article is for informational and educational purposes only, not financial advice. Cryptocurrency assets are highly volatile and carry significant risk. Always do your own research (DYOR) and never invest more than you can afford to lose.
