PGS Catalog file does not have rsID

Hi all, I am trying to use a PGS Catalog file (PGS000013) to calculate PRS scores. The PGS file that I am using has ~6 million variants and does not have rsID. The issue is that using a python library or an api to map each of the 6 million variants to a rsID is really really slow, which is why I am not able to calculate the PRS Score using that file with PRSice. Is there a faster way to map chromosome positions to a rsID or are there any other repositories similar to pgscatalog.org?