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Can you put "Number of Records" on the empty viz? That'll tell you how many rows are you dealing after the join.
What's the number? Is it low/high? Is it expected?
First reaction is that your join is invalid and it produces a bad cross-join which results in the explosion of records Tableau has to deal with.
Yes you are correct . the number was high around 20 M records.
So i did check the raw data and found out that there was a problem with the mapping variable- employee name.
The name format was different in some tabs... and that was the issue...and fixed it
Now it's working fine...
and while i was checking on the Performance issues on Tableau, i found the below link which would be helpful....