25 expressions are a lot.
1. Can you reduce that amount? Perhaps by precalculating some results and store in a table.
2. How complicated are the expressions?
Can you reduce the size of the file? Many times not all the data that is in a report is actually used. Perhaps you can remove some data fields completely?
Also, make sure your are employing all possible best practices. A simple search on this forum will yield loads of useful information on this - it is well worth taking the time to read it!
Hope this helps,