Subtotal Function Unbearably Slow

[EWek1]

I have a relatively small file (765 KB csv file) that has about 24000 rows with 3 columns. When I try to use the SubTotal Function, the machine slows to a crawl and I haven't been able to wait long enough for it to process. I sent the file to a friend and he was able to add the subtotal information in 2 seconds.
What could the problem be? This is excel 2007. Please help!
TIA!!!

 

[EWek1]

no one has any experience with this?

 

[SamTYler]

Are you performing the subtotal on the .csv file, or are you inporting the .csv file to Excel first?

 

[EWek1]

csv is that no good?

 

[SamTYler]

probably

 

[EWek1]

Interesting. That does seem to be the problem. I imported the data instead and all seems ok.
thanks!