Hello and thank you all for the software!
I discrovered one thing, which might be optimized.
When I apply a formula to a column (say "1"), using the values from the other column (say "2"), the result column ("1") gets filled with zeroes all the way to the end, even for the cells where values in column "2" are absent.
I think it would be much more convenient, if the size of the used columns would be tracked, and only applied to the point, untill numbers exist in the used in the formula columns.