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When a simple filter spikes CPU to 100%, your tools need rethinking.

If you're experiencing abnormal CPU and RAM usage while working with a simple Excel file, you're not alone.

3 min readMicrosoft Excel | Help & Support with your Formula, Macro, and VBA problems | A Reddit Community

The recent surge in CPU and RAM usage within a simple Excel file is a subtle yet telling indicator of how modern spreadsheet tools interact with underlying systems. When a modest file—containing only 2000 rows and 100 columns—triggers such a dramatic performance shift, it raises questions about the complexity hidden beneath the surface. The scenario described is far from isolated; it's a symptom of a broader pattern where seemingly straightforward operations can strain resources when executed with certain formulas or data structures. This phenomenon underscores the importance of understanding not just what Excel does, but how it behaves under different conditions.

What makes this situation particularly intriguing is the context of the system itself. A Lenovo T14 5th Intel Core Gen Ultra 5 processor paired with 16GB of RAM is a capable machine, yet it still struggles with a seemingly simple function. This discrepancy hints at the limitations of even the best hardware when paired with inefficient code or unexpected data patterns. The fact that no queries or connections are present, yet the performance drops so drastically, emphasizes how quickly assumptions can be overturned by unseen variables. It's a reminder that optimizing spreadsheet tasks isn't merely about speed—it's about anticipating the hidden forces at play.

Drawing a parallel to real-world challenges, such as managing queries in Excel Online or ensuring sufficient memory when filling all cells, suggests that these issues aren't new but are part of ongoing user struggles. By analyzing this case, we see a clearer picture of why users feel overwhelmed despite having solid hardware. It encourages a deeper reflection on the balance between complexity and capability in modern digital tools. As we move forward, it's crucial to stay vigilant about these signals, adapting our strategies to maintain productivity without compromising performance. The takeaway here is clear: understanding the underlying mechanics can turn confusion into clarity.

From Microsoft Excel | Help & Support with your Formula, Macro, and VBA problems | A Reddit Community

I've opened a simple excel file with 2000 rows max and about 100 columns. When I running a simple filter function (crtl + shift + L), the CPU usage goes from 1% to 100% and RAM from 300MB to 3GB. The system I'm using a Lenovo T14 5th Intel Core Gen Ultra 5 16GB RAM (also running on AC power with the BEST Performance preset). The file has no queries or connections. Just a simple xlookup formula for one column that pulls a result from another sheet that has 26 rows with 3 columns.

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