Having access to a free reporting tool like Lighthouse in DevTools is a great start for diagnosing performance issues by identifying bottlenecks on the main thread. Even better are paid tools like [SpeedCurve](https://www.speedcurve.com/?utm source=smashingmag&utm medium=magazine&utm campaign=sm7 2023&utm id=sm7 2023&utm term=sm7 2023) to dig deeper into the data for more targeted insights and to produce visual reports to help make a case for performance improvements for your team and other stakeholders.