A recording in the Performance Panel looks at first glance like a colorful bar chart. Combining Flame Chart, Call Tree, Bottom Up and Event Log reveals the actual cause of jank, a blocked main thread and poor Web Vitals, instead of just treating symptoms.
ESM and CommonJS are two fundamentally different module systems that must coexist in the same Node runtime, and that is exactly where ESM/CJS interop problems come from. Anyone who does not understand the difference between require() and import will eventually hit ERR_REQUIRE_ESM, lost named exports, or a broken instanceof check caused by a dependency loaded twice.