WebI report created on top of HANA table taking too much time to refresh

Dear Experts,

I have a table in HANA named "T_PROF". I have created a Business layer on top of this table and have created a report using this universe. There are no calculations in WebI. But it takes too much time to refresh. For around 0.1 million records it takes around an hour to refresh.What are the possible cuases for this wierd behavior.

Thanks,

Rajesh