Try using libdeflate?

[zhiyangyou]

Hi, first of all, thank you for writing OpenXLSX. I applied it to the toolchain of the Unity project, and it can parse Excel in milliseconds (there is almost no delay in loading xlsx files).

When using OpenXLSX to open an Excel file, the decompression of the zip file seems to consume a considerable amount of time. So I started to think about whether I can speed up the decompression of zip. Later I found zziplib and libdeflate https://github.com/gdraheim/zziplib https://github.com/ebiggers/libdeflate Is it possible to use zziplib to parse the format of the zip file, including the byte position information of each entry, and then use libdeflate to decompress it, so as to speed up the opening of Excel.