Sun Jul 25 2021 19:36:04 UTC
Lets chase out the bugs guys!!!
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ID Product Comp Assignee Status Resolution Summary Changed
52834 POI XSSF dev RESO FIXE ColumnHelper.getColumnWidth does not scale to large numbers of rows, with large numbers of merged regions 2020-03-08
58896 POI SS Commo dev RESO FIXE autoSizeColumn() is extremely slow if worksheet contains merged cells 2020-03-08
2 bugs found.

as

File a new bug in the "POI" product