I have a large spreadsheet with about 156k rows, that ive divided into rows of 10k. I only want the duplicate values. So, I've performed conditional formatting, and added a filter. Problem is, when trying to filter by color, excel indexes all values of 10k before allowing the drop down to appear to filter by color. This takes 5 minutes each time. Is there a short cut? I'm really trying to save time, and there are 16 spreadsheets now.