Solver slow
 

I have a large workbook that includes a macro that first sets calculation
mode to manual and then starts the Solver. All data and calculations used by
the Solver are located in a single worksheet. It is really slow. It is like
if the Solver is doing an "Application.Calculate" at each iteration,
calculating all worksheets, which would make sense.
- Am I right thinking that the Solver use "Application.Calculate"?
- If yes, is it possible to specify to the Solver to calculate only a given
worksheet?
Thanks.