Report takes too much time redering in excel

Hi,

I have 21K odd records in DB. My report has 30 fields and header to display. It takes almost 8 to 10 mins to display report in excel.

I am using SQL server as DB. Data is getting retrieved from a stored proc. DB returns same data in around 26-30 secs. I am using JNDI connection at pentaho side.

Why is it taking so long? Is there any way to make it faster?

Regards,
Jayesh