Qt Canvas Painter introduces QCanvasPath and path groups as mechanisms to boost 2D rendering performance. QCanvasPath stores path data more efficiently than QPainterPath (using ~60% less memory with a cache-friendly SoA format), allows reuse across frames, and shares the same API as QCanvasPainter for easy porting. Path groups map to single GPU vertex buffers, enabling GPU-side caching so that transforms and color/gradient animations don't require vertex buffer updates. The post also demonstrates progressive rendering on embedded devices, where different graph components are updated at different frame rates using path groups, achieving steady 60fps with lower CPU/GPU load. Qt Canvas Painter is graduating to a fully supported module in Qt 6.12.
