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How to Build a JavaScript Event Calendar That Handles Thousands of Events Efficiently

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Developing a high-performance JavaScript event calendar becomes complex when dealing with thousands of events, overlapping time ranges, and continuous navigation. A key architectural principle is separating the storage of a large event dataset from rendering only the currently visible portion, keeping DOM size bounded regardless of total data size. Continuous navigation should recycle off-screen calendar segments rather than appending indefinitely, maintaining only previous, current, and next views in memory. True virtualization goes beyond hiding elements with CSS and must limit mounted segments, rendered event nodes, listeners, and cached state. Efficient event lookup also requires indexed data structures so queries like 'which events fall in this date range' avoid full-array scans during every navigation or view change.

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