The "million row limit" in Excel is a relic. Even when using tools like VS Code or Notepad++ for large files, the memory pressure often makes the UI unusable.

DataOlllo is a lightweight viewer designed to stream data directly from disk. It handles massive CSVs and modern formats like Parquet and Arrow natively. It’s been helpful for my workflow when I just need to filter and export a subset of a massive dataset without spinning up a Jupyter notebook.