Imagine a situation where performance drops due to a problem in JS code. What would you check in DevTools profiler to confirm or deny this hypothesis?
sobes.tech AI
Answer from AI
In the DevTools profiler for checking performance issues caused by JS code, the following points should be considered:
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CPU profiling: look at which functions take the most execution time. If there are "hot" functions with long durations, it confirms a problem in JS.
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Call Tree and Bottom-Up: analyze the call stack to understand which chains of functions cause delays.
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Event Log: check if event handlers, such as scroll or mousemove, are called too frequently.
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Memory: check for memory leaks that could slow down performance.
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Timeline: see if JS is blocking the main thread, causing rendering delays.
If the profiler shows that JS is actively loading the CPU and taking a lot of time, the hypothesis is confirmed. If JS runs quickly, the problem might be elsewhere (for example, in rendering or network requests).