Is there a way to speed up the calculations of SmartXLS? workbook.recalc()

Question

In my Java project I use the Excel-FrameWork "SmartXLS" to calculate Excel files. http://www.smartxls.com/indexj.htm

To do this, the file is filled with values and then these are calculated using the method:

workbook.recalc();

This all works well. The only problem is when the file contains several sheets and a lot of formulas.

In my concrete problem case I have a file with 11 worksheets and about 50000 - 60000 single formulas respectively calculations. The file is about 3.5MB in size. The time for the calculation is between 5 - 7 seconds (workbook.recalc()).

I realize that in Java you probably can't reach the speed of calculation as when Excel runs native for example in a Windows environment. To reduce the size of the file I have already reduced the formulas to a minimum.

Do you have experience with SmartXLS? Are there any tips and tricks to speed up the calculation?

Or do you know other FrameWorks that provide fast calculations?

Does anyone have experience with POI and large Excel files and many calculations?