GeoIP2Fast for Lambdas is the fastest GeoIP2 country/city/asn lookup library. Loads A search takes less than 0.00003 seconds with a ridiculous footprint (<1mb). It has its own data file updated twice a week with Maxmind-Geolite2-CSV and is Pure Python! No dependencies, no external databases, no api requests... can be used in a layer or inside your code, and uses the ephemeral disk as cache...
Soon... (doing the final tests)