IP Geolocation — Where the Slow Visits Are Coming From
This reports the approximate location and the network operator behind an IP address. Accuracy varies a lot: country is usually right, city frequently is not, and an address behind a corporate network, a mobile carrier or a VPN may resolve nowhere near the person using it. Treating it as a hint rather than a fact is the correct posture.
When it helps
Usually to add context to a report you cannot reproduce. Someone says the site is unusably slow and it is fast for you; knowing they are on a mobile network on another continent reframes the problem entirely, from a bug in your code to a question about where your assets are served from. It is also how you sanity-check whether a burst of unusual traffic is coming from a hosting provider's range rather than from anything resembling real users.
Worth running automatically
Individually it answers a question about one visitor. Aggregated over real traffic it answers a much better question — where your users actually are — and that answer routinely contradicts what the team believes. Field measurement segmented by country is the version of this worth having, because it tells you not just where people are but what the page costs them there, and that is what should drive decisions about delivery rather than assumptions about your audience.
What you get out of it
Turns an unreproducible performance complaint into a plausible explanation, which is usually enough to know whether to act. Aggregated across real visits it does something better: it replaces an assumption about where your audience is with a measurement, and the two are often not the same.