Santiago has been the marketer and site manager for FixMyCar.com for the past 15 years. They and the developer team have spent much effort improving the user enjoyment of the site. Recently, performance metrics are showing the speed of the site has regressed significantly over time. Which long-term maintenance programme can help by limiting certain metrics that affect performance?

A performance budget is a set of defined limits on metrics that affect website performance, such as image size, script load time, or total page weight. By establishing and adhering to these budgets, Santiago can prevent performance regressions over time, ensuring the site remains fast and responsive. This proactive approach helps maintain a good user experience and avoids the need for extensive, reactive overhauls. An independent testing programme might identify issues but doesn't set limits to prevent them. A performance maintenance team is a resource, not a program that defines limits. A long-term performance audit assesses performance but doesn't proactively control it.