custom compression level for Workbook.save
Created originally on Bitbucket by Cristian Ciupitu
Saving large workbooks with 100K rows can take a lot of time. Being able to use a custom faster compression level could speed things up.
If I'm not mistaking the default compression level is zlib.Z_DEFAULT_COMPRESSION
= 6, with faster options being zlib.Z_BEST_SPEED
= 1 and maybe zlib.Z_NO_COMPRESSION
= 0.