DataTable Performance Tracking

v1: Minimal Foundation

Data: 10,000 items, 1 column.
Scroll Test: 100 scrolls (20,000px total).
Results:
- refreshCount: 101
- refreshTime (total): ~45.7ms
- averageRefreshTime: 0.45ms
- totalNodes: 3030 (avg 30/frame)
Notes: Silk smooth, base VirtualScroll works perfectly.

Data: 10,000 items, 10 columns.
Scroll Test: 100 scrolls (20,000px total).
Results:
- refreshCount: 101
- refreshTime (total): ~101.2ms
- averageRefreshTime: 1.01ms
- totalNodes: 3030
Notes: Removed .dt-body wrapper to simplify DOM depth. Changed onScroll to execute container.refresh() immediately instead of wrapping it in requestAnimationFrame.

Data: 10,000 items, 10 columns.
Scroll Test: 100 scrolls (20,000px total).
Results:
- refreshCount: 100
- refreshTime (total): ~176.9ms
- averageRefreshTime: 1.76ms
- totalNodes: 4500 (avg 45/frame)
- scanCount (per frame): 0 (Maintained Zero-Scan)
Notes:
- Added complex Area Selection, Copy/Paste, and Row Deletion.
- Successfully decoupled dynamic UI states (like .dt-cell-selected) from the declarative binding framework. We now use manual DOM manipulation (applySelectionUI) during refresh to sync states.
- This manual sync completely prevents "Dependency Floods" where scrolling would trigger heavy $class evaluations on every cell. We maintained the Zero-Scan status while supporting rich interactions.
- Fixed a VirtualScroll jumping bug at row 70+ by re-enabling onItemUpdate so VirtualScroll correctly learns the 40px row height instead of using its 32px default.
- Scroll Initiation Fix: Removed the setTimeout wrapper around vs.init during reset. Previously, the first scroll often hit a "blank wall" because VirtualScroll's internal metrics hadn't finished initializing when the user made their first swift scroll motion. Synchronous initialization resolved this completely.