Faster IP geolocation needed

i just rolled out a new feature for my SaaS that really leans on showing localized content. basically, users see different stuff depending on their location, and i'm using IP geolocation data to make that happen. it's super important for the user experience to get this right.

the big issue i'm running into is the current IP geolocation API i'm using is pretty darn slow. for some users, it's adding like 500ms or even more to their page load, which is a killer for UX. i'm trying really hard to get this latency down, becuase every millisecond counts when you're trying to keep users engaged. we need to lookup their IP address quickly.

so, what are folks here using for really fast IP geolocation? i'm talking about solutions that can deliver sub-100ms response times globally, if possible. any tips for smart caching strategies or specific providers you've had good experiences with? maybe even self-hosting an IP address database?

waiting for an expert reply on this, thanks!