Build 3.0.0.127 of xlsgen has a fix for worksheet duplicate. The fix applies to XLSX files and preserves custom column widths across scenarios (migrate, ...).
Build 3.0.0.126 of xlsgen includes faster rendering of cells. This is obtained by avoiding multiple computation of the same cells and multiple extraction of the same cells. 10% in speed is expected.
Build 3.0.0.125 of xlsgen includes a a faster autofit algorithm. This algorithm has a cache that will avoid unnecessary calculations in cases where columns or rows are filled with the same values.
Build 3.0.0.124 of xlsgen has a fix for rendering cells (this is used in print/preview/PDF/...). Whenever cells are centered horizontally, xlsgen computes a better layout.