Cell calcs taking AGES on pactice World Cup spreadsheet

Hi,

Thought I'd try improve my v. basic Excel skills by doing a WC2014 Spreadsheet.
I have a quad core processor but it takes about 10seconds to calculate the cells!!
I assume this is down to noobish / naive programming?
Any advice appreciated.

Thanks, Ben.

Looks pretty good - no obvious errors.
However, it takes less than a second on my system, so any changes I tried, I could not detect any real change (didn't feel like creating a macro to time the calculations). Some thoughts (no guarantees if these help):
Use SUMIF instead of SUMIFS - probably no difference, but SUMIF should have an 'easier' algorithm, and thus may be faster.
As for your Q column, I believe the SUMPRODUCTs are slowing you down. Any reason Q4 (and the equations below it) can't just be:
=SUM(R4:T4)
???