Enhancing NServer Performance: Resolving Single-Threaded Blocking Operation Bottlenecks in Python DNS Framework

NServer, a Python DNS framework, suffered severe throughput degradation (from 10,000 rps to 25 rps) due to its single-threaded architecture blocking on I/O operations. Version 3.2.0 introduced a multi-threading solution with three thread pools (query receiver, configurable workers, response sender), achieving 12x–48x throughput improvement. Asyncio was considered but rejected due to the high refactoring cost of the existing synchronous codebase.