[DataGridPro] Improve tree data performance #9682
Merged
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Fixes #8581
It's >3x faster for 10k top-level rows:
v5: https://codesandbox.io/s/intelligent-lewin-j4yv2y?file=/demo.tsx
HEAD: https://codesandbox.io/s/funny-rui-nl4rs4??file=/demo.tsx