I have Excel sheet with 5000 rows and columns till AY (size 12MB). Except for the first 6 columns, rest contain either vlookups or formulae. All the vlookups are in separate Excel sheet. I have changed the Excel setting to manually update the links and calculate formulae. Now everytime I try to update the links, either the Excel sheet hangs or it takes something like 15 minutes. Any ideas on how I can get it done quickly.