Posted 13 November 2020, 1:32 am ESTHi,
I updated SpreadJS from version 13.1.1 to version 13.2.3.
Now collapsing the row group is very slow. With attached excel file if you click level 3 on top it lasts over 40 seconds. With previous version it took only 1 second. Is it possible to get fix for version 13?