SSRS Caching does not work with different query criteria

Hi Everyone,

I have a report having parameters; i.e. FromDate & Todate. I am creating & scheduling Caching dynamically for the specific FromDate and Todate. 

Lets say today's Cache query criteria are : FromDate - 01/01/2012ToDate - 11/30/2012

Out of 50 users 25 users are using above values to view the report so report executes fast for them, but other 25 users may not use these criteria. They are querying different FromDate and Todate within above date range. Here, I am not seeing any performance for these 25 users. Can I use the same cache data for querying result with different query criteria? 

Do you know if we can query the result with more criteria within range? What are limitations of SSRS Caching?

Can anyone help me?

Thanks in advance.

Hiren Kapadia