Macro to delte Duplicate rows across multiple sheets
 

I have a big spread sheet with multiple tabs. Would like to find a macro that could go in each tab and delete duplicate rows (using column A as identifier). Each tab is different so I can not combine. I need macro to go into each tab and delete duplicates. I have a macro that I use but it is terribly slow for the amount of data I need to organize. Any insights appreciated. Thanks.