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In 2019, I watched a trading dashboard crawl to six frames per second. The team had spent two weeks tweaking shaders and debating React reconciliation. The real culprit? A single oversized draw region that invalidated the entire canvas on every price tick. That day taught me something I still repeat in architecture reviews: the draw region is where rendering performance lives or dies. If you're building anything with custom graphics—trading interfaces, data viz, mapping tools—you're probably mismanaging your draw region without knowing it. And it's costing you. Here's what a draw region actually is, how clipping works under the hood,…