Dashboard Designer runs too slow

Hi mates,

     We have a Dashboard designed and built against Webi reports. The performance is extremly slow, the data's volume is not so much huge but each web service execution versus several webi reports could be the key of the slow performance. I imagine that each request done, each ws is executed, it means that if we hace 15 ws against 15 webi reports, all the time lapsed is summarized and this is the reason of our 3 minutes waiting data; but we can't and we don't know how to manage it in a better way.

Who could help me?

Thanks and regards.