Event Loop blocking and high CPU usage during heavy tasks or JSON operations

Under load, my Node.js server slows down or becomes unresponsive. CPU usage spikes, and incoming requests lag or queue up. What’s causing this slow-down?

Node.js is single-threaded, so CPU-intensive operations like large loops or JSON parsing can block the event loop, halting other tasks (turn0reddit20turn0search9. What to do: • Offload heavy computations to Worker Threads or separate microservices. • Use clustering or PM2 to spawn multiple Node processes to utilize all CPU cores. • Stream large payloads gradually instead of parsing the full object in memory. • Monitor event loop lag with tools like watchlog or Node’s built-in performance hooks.turn0reddit20turn0search6turn0search9