How React List Virtualization Kept a Live Chat Feed Stable at 3,700+ Messages

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A frontend developer built LiveShop, a simulated live-shopping stream UI, to study how chat feeds behave under high message volume — a scenario rarely covered in tutorials. Testing revealed that a standard React list render accumulated over 3,300 DOM nodes at 3,700 messages, causing frame rates to drop to 25fps with visible stutter during simulated spikes. Switching to react-window, a list virtualization library, reduced the active DOM node count to just 14 at any time by rendering only the rows visible in the scroll viewport. After the change, the same stress test maintained a steady 60fps regardless of total message count. Additional optimizations, such as capping concurrent reaction animations at eight, further stabilized performance under rapid, unpredictable input bursts.

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