Suggestion for improve tab bar render.
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Tab bar slow render on tabs change size event when tab bar have many tab on it even most of them hibernate and group up less then 20 groups, I guess the render code of this section is calculate all tab in collection even they don't show on tab bar so I suggest to remove group up tabs off render collection and store it else where to reduce workload on render tab bar (or create a new collection like tab render_tabs[]; for specify it).
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