Answer
Monitor event loop delay, profile CPU usage, examine GC pauses, inspect slow promise chains, and offload heavy tasks to workers. Use flame graphs to isolate the offending code.
Quick Answer
Event loop stalls show up as high event loop lag (measured via perf_hooks.monitorEventLoopDelay). Detect in real-time by periodically sampling the event loop delay and alerting when it exceeds a threshold. Fix by identifying and moving blocking code to worker threads. Use clinic.js or 0x for flamegraph analysis to find the specific blocking call.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ