吉乐是 LaughItUp.com 网站的产品经理，这个网站是幽默搞笑者的聚集地。今年早些时候，网站反馈中出现了许多抱怨响应能力太差的评论。在与网站营销团队和开发团队合作后，吉乐制定了一个方案，规定网站响应能力指标不得低于特定的水准。 这个方案属于哪种类型？

A performance budget is a set of defined limits on metrics that affect website performance, such as page load time, image size, or JavaScript execution. Jile's plan to set a minimum standard for website responsiveness is a classic example of a performance budget because it establishes a threshold that the website's performance must meet or exceed. This proactive approach helps ensure a good user experience by preventing performance degradation. "速度阈值" (speed threshold) and "速度方案" (speed plan) are too narrow, as performance budgets encompass more than just speed. "性能方案" (performance plan) is too general; a performance budget is a specific type of performance plan.