How to draw thousands of objects on a map and not kill FPS: the evolution of rendering in Mapbox GL
Summary
This article explains how to render thousands of map objects efficiently in Mapbox GL without hurting frame rate. It compares older UIView-based annotation approaches with GPU-driven style layers such as MGLSymbolStyleLayer, MGLCircleStyleLayer, and MGLHeatmapStyleLayer. The piece shows how zoom-dependent rendering, data-driven styling, and expression-based opacity and radius calculations reduce CPU load and improve animation smoothness. It also discusses clustering, spatial indexing with QuadTree, and Web Mercator math as practical tools for scaling map performance.
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