Here are some ways to optimize Excel performance when working with large datasets and filtering:

* Filter smaller data subsets: Instead of filtering the entire dataset at once, consider using techniques like creating PivotTables or filtering smaller portions of data that you're currently working with.
* Apply filters to hidden data: If you have helper columns or temporary data used in calculations, hide those columns before applying filters. This reduces the amount of data Excel needs to process.
* Use advanced filtering techniques: Explore options like filtering by cell color formatting or conditional formatting rules. These can be more efficient than filtering based on text or numbers in large datasets.
* Utilize tables: Convert your data to an Excel Table. Tables offer built-in filtering functionality that can be faster than manual filtering on large datasets.
* Minimize volatile functions: Avoid functions like TODAY() or NOW() that recalculate on every change. If possible, use static values or calculate them once and store the result.
* Optimize formulas: Break down complex formulas into smaller helper columns. This can improve calculation speed, especially when filters are applied.
* Consider hardware upgrades: If you're working with truly massive datasets, investing in additional RAM or a faster processor can significantly improve Excel's performance.
* Use manual calculation mode: When working with large datasets and frequent filtering, consider switching to manual calculation mode. This allows you to recalculate only when necessary.
* Filter by criteria before sorting: If you plan to both sort and filter, apply filters first. Sorting a filtered dataset is generally faster than sorting the entire dataset.
* Copy filtered data instead of filtering in-place: If you need a filtered view for further analysis, consider copying the filtered data to a new location rather than relying on the filter itself. This can improve performance, especially when working with complex filters.

By implementing these techniques, you can significantly improve the responsiveness of Excel when working with large datasets and filtering operations.