We are introducing throttling on our WebSocket API for the following three orderbook topics: : orderBookL2 – 50ms.orderBookL2_25 – 50ms.orderBook10 – 50ms. All changes will be available in Testnet from 14 September 2023 at 04:00 UTC and in Production from 19 September 2023 at 04:00 UTC. There is no change required on client side. The market data protocol used is backwards compatible but we recommend you to read the below blog post for more detail. Important Update: WebSocket OrderBook Throttling.