Vitor-Avila commented on PR #34603:
URL: https://github.com/apache/superset/pull/34603#issuecomment-3202736152

   To test this PR, I had Claude Code generating a CSV with 20k rows (~11MB). 
Added some logging to monitor endpoint performance. Importing this on `master` 
to a Redshift cluster:
   ```
   Starting upload now at  2025-08-19 19:28:46
   Finished uploading at  2025-08-19 19:31:47
   ```
   
   Second run for good measure:
   ```
   Starting upload now at  2025-08-19 19:42:32
   Finished uploading at  2025-08-19 19:44:22
   ```
   
   **Average: 145s**.
   
   Then, uploading same file with these changes (same Redshift cluster):
   ```
   Starting upload now at  2025-08-19 19:55:10
   Finished uploading at  2025-08-19 19:57:15
   ```125
   
   Second time:
   ```
   Starting upload now at  2025-08-19 19:59:59
   Finished uploading at  2025-08-19 20:01:23
   ```
   
   **Average: 104s**.


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