Find & highlight rows using VBA

Hi Experts,

I need to highlight duplicate rows based on 3 columns using VBA.

This is what I am looking for.

Compare the values in column B, F & H.
Highlight the duplicate values in column F & H. Also highlight the newest value in "Green" in column L & M based on the date in column B. I've attached a sample spreadsheet.

I tried using the conditional formatting with formula but my spreadsheet is freezing and lands in to recovery mode. The file has more than 10000 rows.