Can get great performance during Excel Operations by enabling Multi Thread in Excel.
How to Set Number of Threads -
Office Button=>Excel Options=>Advanced=>Formulas 'Enable multi=threaded
Is the option available in both 32 and 64-bit versions? I am using 32-bit version, I cheched the option you showed but still when performing big calculations, Excel is using exactly 25% of CPU (4-threaded). It seems like Excel is using only one thread. If it is so, then what for "Enable multi-threaded calculation" option is visible in 32-bit Excel?
Przemysław, I have exactly the same situation - I hope someone comes along with an answer.