How to Reduce swf file size

Hi, 
I had a query regarding reducing the published swf file size.
How do I reduce the swf file size, as it is taking lots of time to upload on the e-learning portal.
I follow this procedure for publishing:-

1.Import powerpoint file in captivate.No. of slides: 10
2.Project Dimensions:- 735X545. Option to advance slide:-Automatically
3.Add audio to all slides .MP3 file
4.Delete unwanted files from library
5.Publish:- selecting swf format

With the same options and same procedure, I used to publish such files and they used to be around 1-3 MB size,
while now they are of 1-10 MB file size.