Hi all

I have a list of SNPs of the form chromesome:position and I want convert them to rsIDs. I tried Biomart package in R but it was too slow, it will take forever to convert 4 million SNPs. I believe it is possible to download the GRCh37 data and do the job locally instead of requesting information from Ensembl. Does anyone know which is the correct dataset to download and which software I should use? I've download some dataset but they were not the right one, if you can provide a link that will be very helpful.

Thanks a lot. ```