romannerez-giraffesoftware opened a new issue, #35981:
URL: https://github.com/apache/superset/issues/35981
### Bug description
### Problem
When using the Pivot Table visualization in Apache Superset with large
datasets (e.g. 20k+ rows × 10 columns),
the browser freezes or becomes unresponsive.
This seems to be caused by the fact that the table renders all DOM elements
at once (no virtualization / windowing).
### Steps to reproduce
1. Create a Pivot Table with a dataset larger than ~20,000 rows
2. Open the chart in Explore view or in a dashboard
3. Observe the browser lag, high CPU usage, and slow page response
### Expected behavior
Pivot Table should render only the visible portion of the table, using
virtualization (lazy rendering / windowing)
to support large datasets efficiently.
### Environment
- Apache Superset version: 5.0.0
- Browser: Chrome / Edge / Firefox
- Deployment: Docker / Local dev
### Suggested solution
Integrate a library like `react-window` or `react-virtualized` into the
Pivot Table plugin.
Example pseudocode:
```js
import { FixedSizeList as List } from 'react-window';
<List height={600} itemCount={rows.length} itemSize={35}>
{({ index, style }) => (
<div style={style}>{renderRow(rows[index])}</div>
)}
</List>
### Screenshots/recordings
_No response_
### Superset version
master / latest-dev
### Python version
3.9
### Node version
16
### Browser
Chrome
### Additional context
_No response_
### Checklist
- [ ] I have searched Superset docs and Slack and didn't find a solution to
my problem.
- [ ] I have searched the GitHub issue tracker and didn't find a similar bug
report.
- [ ] I have checked Superset's logs for errors and if I found a relevant
Python stacktrace, I included it here as text in the "additional context"
section.
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