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Discover how to enhance the performance of your Excel VBA code for deleting empty rows in a large dataset, cutting down execution time significantly.
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This video is based on the question https://stackoverflow.com/q/77757468/ asked by the user 'AmbRenoTest' ( https://stackoverflow.com/u/23100618/ ) and on the answer https://stackoverflow.com/a/77760328/ provided by the user 'Tim Williams' ( https://stackoverflow.com/u/478884/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Speed Up Your Excel VBA Code: A Guide to DeleteEmptyRows Optimization

When dealing with Excel data, managing large datasets can be challenging, particularly when it comes to cleaning up unnecessary empty rows. If you're like many users, you might have noticed how frustrating it can be when your macros run slowly, consuming valuable time—sometimes taking upwards of 15 minutes to process! In this guide, we will guide you through an optimized approach to speed up your VBA code, specifically aimed at achieving the task of deleting rows without values in Column H.

Understanding the Problem

You currently have an Excel file with approximately 4,000 rows, and your goal is to remove lines where Column H is empty. Unfortunately, your existing code takes too long to execute, hindering your productivity. Here's a simplified breakdown of your original method:

Code Characteristics:

Loops through each line in Column H.

Checks for empty values.

Deletes rows one by one, which can be very slow for large datasets.

The Optimized Solution

Instead of myopically focusing on each line, we recommend using a different technique that leverages a helper column and the Evaluate function. This approach is more efficient and can significantly reduce processing time.

Step-by-Step Breakdown

Set Up the Worksheet
Begin by defining the worksheet and determining the last row in Column H.

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Using a Helper Column
Instead of directly checking each cell, we will use a helper column (an empty column adjacent to your data) to create a formula that quickly identifies non-zero values.

[[See Video to Reveal this Text or Code Snippet]]

Creating an Evaluation Formula
With the helper column in place, we will create a formula to mark which rows contain non-zero values. The formula will output "x" for rows that contain data and leave blanks for those that are empty.

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Deleting Empty Rows
Now that we have marked the necessary rows, we can use the SpecialCells method to delete all blank cells in our helper column efficiently.

[[See Video to Reveal this Text or Code Snippet]]

Final Touches
Finally, we clear the contents of the helper column and provide the user feedback on the operations performed.

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Complete VBA Code Example

Here’s the complete optimized code for your reference:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By utilizing a helper column and the powerful Evaluate function, you can dramatically cut down the time it takes to delete empty rows in your Excel VBA projects. The new method can often accomplish the task in a matter of seconds, regardless of how large your dataset may be!

Feel free to copy the code provided and implement these changes in your VBA projects. Your efficiency will thank you!