Fast for me, slow for everyone else
People keep saying the site is slow. It is not slow for you, it is not slow in the lab, and every synthetic test you have run comes back green. The reports are real and you cannot reproduce a single one.
Why it is hard to see
You are testing from one place, on one connection, with a warm cache. The people complaining are not. A page that loads in half a second beside the server can take five seconds several thousand kilometres away, and no amount of testing from your desk will show it.
Averages hide it too. If nine in ten of your visitors are near you, the mean stays comfortable while a tenth of them have an experience you would not tolerate for a second.
What Sixty does about it
Real timings from real visits — largest paint, interaction response, layout shift — per route, and broken down by country. That breakdown is the whole point: it is what separates "our code got slower" from "this is a network problem for people in Brazil", and those have completely different fixes.
It is measured in the browser and reduced to shapes before it is sent. No URLs, no session IDs, nothing about the person.
What it does not do
A country breakdown tells you where, not why. If the answer is distance, the fix is a CDN or an edge region and not something a code change will solve — and this will say so rather than pointing you at your own functions.