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https://issues.apache.org/jira/browse/ATLAS-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasad P. Pawar updated ATLAS-5395:
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Parent: ATLAS-5391
Issue Type: Sub-task (was: Task)
> Atlas UI: Lazy-load widgets, optimize sidebar tree rendering, fix layout
> shift animations
> -----------------------------------------------------------------------------------------
>
> Key: ATLAS-5395
> URL: https://issues.apache.org/jira/browse/ATLAS-5395
> Project: Atlas
> Issue Type: Sub-task
> Components: atlas-webui
> Affects Versions: 3.0.0
> Reporter: Prasad P. Pawar
> Assignee: Prasad P. Pawar
> Priority: Major
>
> After API deferrals, improve perceived performance and main-thread
> responsiveness.
> Issues:
> - Below-fold widgets (RecentActivity, charts, KafkaTopicSummaryCard) load
> eagerly with main dashboard
> - d3/Recharts chunks (~210 KB) in initial critical path
> - 1315 DOM nodes in sidebar; tree rebuild causes re-render storms
> - 8 non-composited animations: MuiCollapse-root animating height property in
> sidebar trees (causes layout thrashing, contributes to CLS 0.071)
> - 15 layout shifts in classification tree expand/collapse
> Fixes:
> 1. React.lazy + IntersectionObserver for below-fold dashboard cards
> 2. Load Recharts/d3 only when chart enters viewport
> 3. Defer DashboardOverview mount until after search bar paints
> 4. useMemo for tree data transformation; React.memo on tree row components
> 5. react-window virtualization for trees with 100+ nodes
> 6. Replace MuiCollapse height animation with transform/opacity OR use CSS
> transition on max-height with will-change: transform to avoid non-composited
> animations
> 7. DashboardSkeleton during API wait; no layout shift when data loads
> Acceptance Criteria:
> * d3/Recharts not in initial critical path on search route
> * Charts render when scrolled into viewport
> * Lighthouse {{non-composited-animations}} = 0 (or ≤ 2 acceptable)
> * Expand/collapse does not re-render entire tree
> * CLS ≤ 0.1 after tree interactions
> * QuickSearch usable before full typedef load completes
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