Can someone please explain this to me.....

My old laptop had a 2.16Ghz processor with 2GB of ram and this spreadsheet
that I'm working with was a bit slow when calculating due to it's size but it
wasn't terribly slow. Now I have a new laptop with the core 2 duo processor @
2.33Ghz with 4GB of ram and it seems even slower when calculating this
spreadsheet. Why and how is this possible when I have more ram and a faster
processor? Am I missing something here???

Oh and I'm using Excel 2007 on both systems.