That shouldn't be the case - Calc should easily be able to handle 80,000+
rows at a time. Which version of Calc are you using? The latest 6.2.2 is very
stable. Also, how are you installing it? I prefer to download from the
Libreoffice website and install from there, as many distributions only supply
outdated or poorly configured versions in their repositories.
Also, what do you mean by freezing? I've dealt with 650,000 rows of data in
Calc at a time, and if I apply a formula to the entire spreadsheet Calc will
appear to "freeze" for a few minutes, but it is just taking the time it needs
to calculate the changes. Do you mean "freezing" in terms of it completely
locking up? Or is it simply acting unresponsive for awhile while it
calculates changes?
Let us know, I'll bet we can help find a solution.