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I am pooling (with a While loop) the entire worksheet to process each cell …The problem is that it is VERY SLOW because the file is huge… ” This is a known problem: doing things cell by cell in Excel is a slow operation.There are tons of sites, pages, and people who are experts as well on this subject, have performed their own tests, and shared their results and ideas.
Just one recalculation and one redraw at the end of your code execution is enough to get the workbook current with all your changes. Enable Events display Page Break State = Active Sheet. Since it requires lots of resources to draw the screen so frequently, just turn off drawing the screen until the end of your code execution.
Here’s some sample code that shows how and what to shut off while your code runs. Display Page Breaks ‘note this is a sheet-level setting ‘turn off some Excel functionality so your code runs faster Application. Be sure to turn it back on right before your code ends.
Note that in the code sample below we grab the current state of these properties, turn them off, and then restore them at the end of code execution. Display Page Breaks = False ‘note this is a sheet-level setting ‘: This setting tells Excel to not redraw the screen while False.
One reason this helps is that if you’re updating (via VBA) several different ranges with new values, or copy / pasting from several ranges to create a consolidated table of data, you likely do not want to have Excel taking time and resources to recalculate formulas, display paste progress, or even redraw the grid, especially after every single operation (even more so if your code uses loops). The benefit here is that you probably don’t need Excel using up resources trying to draw the screen since it’s changing faster than the user can perceive.
Not only did I see a huge variety in how Excel is being used, you also pointed out various tips and tricks for writing fast VBA code in Excel.