Hi @Anu
You'll need to provide a lot more information. For starters, what version of alteryx are you on? How many records of data are being processed? What are the data sources? Is this on desktop or server?
To find out which tool takes the longest to run, enable performance profiling in Runtime.
Do you have a lot of joins in your workflow ? Makes sure there are no duplicates before join as that can mess up the whole thing.