Would this help? https://msdn.microsoft.com/en-us/library/office/ff700515(v=office.14).aspx
It looks like you could time different parts of your calculations using the stuff in there.
Cheers, I may do some experimenting at some point. I kind of knew it wouldn't be as simple as something saying each cell takes x second to calculate as there are various dependencies.
@Chalfie started
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Would this help?
https://msdn.microsoft.com/en-us/library/office/ff700515(v=office.14).aspx
It looks like you could time different parts of your calculations using the stuff in there.