On our real-time payments project, the only non-functional requirement from the business is 'it can't lag at peak.' We process about 500,000 payments a day, the noon hour carries 30% of daily volume, and the clearing network requires a response within 5 seconds. How would you turn that into testable requirements?

实时支付项目里，业务方对非功能需求只说了一句「高峰期不能卡」。已知每天大约 50 万笔交易，中午那一个小时占全天的 30%，清算网络要求 5 秒内必须回执。你怎么把这句话写成可测试的需求？