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Off-main-thread architecture with Web Workers cuts UI blocking in headless B2B frontends

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A global industrial distributor's B2B catalog showed a p75 Interaction to Next Paint of 850 ms on mid-range devices during real user monitoring. The bottleneck was on the client, not the network or CDN, caused by processing an 18 MB JSON payload with 45,000 SKUs that monopolized the browser's main thread. During these bursts, user inputs were queued and the site saw a 14.2% rise in conversion abandonment. The article argues that heavy computation should be moved off the main thread into isolated workers that communicate via serialized messages or shared memory, leaving the main thread only for DOM updates, event handling, and animation.

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