Studio chart performance

Use when a chart feels sluggish in Studio but similar charts (e.g. pie-chart) are fine.

One-line rule

Keep enter animation on paths if you need it, then drop Motion path subscriptions and isolate hover so Studio slider and legend updates don't replay expensive arc/path math across every series every frame.

1. Find what re-renders on every interaction

Studio updates displayState on every slider tick and on legend/slice hover. Trace:

• Does hover live in the same context as data, scales, and animation config?
• Does the preview recreate children (data.map, pattern defs, motion props) every render?
• Does the chart remount unnecessarily (key tied to motion signature vs manual replay)?

Pattern: Split context like cartesian / pie charts — stable slice (data, geometry, animation config) vs hover slice (hoveredIndex, tooltip). Consumers that don't need hover use only the stable hook (usePieStable, useRingStable, useChartStable, …).