--vcf-split option with no description

[shangshanzhizhe]

Hi,

I'm using this amazing tool for genotyping recently. While it seems the step of converting vcf to json is quite slow, and for those longer chromosomes even when I split the vcf file by chromosomes. Does its speed depend on the chromosome length or variants number? I noticed that there were a argument '--vcf-split', will it be helpful?

Shangzhe