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 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. https://smashingmagazine.com/2023/10/speedcurve-fight-main-thread/
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