Hi, I'll be happy to help with this issue - if you remove those rows/columns from the view does it improve calculation time etc?
this command will hide all rows below 100
1) Select row 101(Click on 101 to select the whole row)2) Ctrl-Shift-down Arrow to select all rows below row 1003) Right click on the selection4) Choose Delete first to be sure that all the cells are empty5) Right click on the selection again and choose Hide
and you could do the same for columns too
Let me know if that makes a difference at all