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- Create Date December 7, 2025
- Last Updated December 7, 2025
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This download expands on my earlier post “When Excel is Overwhelmed: Access Excel Integration”, where I demonstrated how offloading data to an Access database can dramatically reduce file size, eliminate VLOOKUP-heavy sheets, and improve performance.
In this follow-up, I take the concept further by introducing cached UDFs (User-Defined Functions) that connect Excel to Access only once, reuse the connection intelligently, and locally cache results for near-instant lookups.
The included Access database and Excel workbook show exactly how to:
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Replace volatile formulas and large lookup ranges with lean, cached functions
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Eliminate repeated database hits by leveraging in-memory result caching
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Maintain data integrity in Access while keeping Excel fast, light, and responsive
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Use Excel as a clean front-end without sacrificing performance
This is a practical, real-world demonstration of how Excel and Access—properly paired—can outperform bloated spreadsheets by orders of magnitude.