Which one is faster? (1 Viewer)

Hi, it's been about a long time I work on a db with MS Access 2010, Now I completed almost everything, but when I run my db it works very hard, specialy when I have lots of data on it. my db is too large and it included lots of calculation operation.
Now my question is:
is MS Access 2003 faster than 2010? because I feel that maybe 2003 is faster than 2010.
waiting for your replay. Thanks in advance

What exactly do you mean by:
-lots of calculations
-lots of data

Can you provide some samples of the calculations?
Can you post a copy in zip format?

We need more details if we are to provide focused responses/suggestions?