Excel consultant recommendation?

[MSkog]

My office has an excel spreadsheet that has grown too large and cumbersome to use. Calculation time runs in excess of 320 seconds with no data. Can anyone recommend a consultant service, preferably one they've used in the past, that could examine the spreadsheet for efficiency gains? There are quite a few consultant services available when I search but I don't know anything about who might be qualified or effective.

Any help is appreciated. Thanks.

 

[Taul]

have you tried Mr Excel (the main website)
MrExcel.com | Excel Resources | Excel Seminars | Excel Products

 

[Michael M]

As well as Tauls comment, does the workbook have any macros ?
Also, how large is it ?
What is being done to trigger 320 seconds to process, running code, recalculating, pivot tables, formatting ??
Has it just started ?
Are you running it on a server ?