BO 3.1 webi report file size is bigger than BO 4.1 webi report

Hi ,

I migrated the report from BO 3.1 environment to BO 4.1 environment and executed the report with the same parameters. Saved the report from both environment into local desk . BO 3.1 .wid file size is bigger than BO 4.1 .wid file .

Any Idea on this ? why BO 4.1 is showing less file size while compare with BO 3.1 .

Thanks & Regards

Venakt