Why the path keeps changing

The address is fixed. It is the same 56 characters every time and it identifies the same service regardless of anything else. That is the stable half.

The path taken to reach that service is not fixed. It is assembled, used, and later replaced, and the replacement happens on its own schedule rather than when you ask. Two loads of the same address minutes apart may travel entirely differently.

• A page that was slow and is now fine with nothing having changed at your end.
• A page that was fine and is now slow, likewise.
• One address behaving differently from another for a while, then not.
• A load that fails once and succeeds immediately afterwards, which people usually attribute to their retry rather than to the change underneath it.

If you form an impression of an address over several visits, you are averaging over paths you did not choose and cannot see. Two people using the same address at the same moment can have genuinely different experiences, and both impressions are accurate about their own path and useless as a general statement.

This is why the board refuses to publish anything about how the addresses perform, even though it would be the easiest content in the world to write. Any such statement would be one observer generalising from a sample of paths, and there is no honest way to present that as information.

They compare the three published strings position by position: how many positions all three share, how many split two against one, and how many differ entirely.

The relevance is indirect but real. Because the three are almost entirely different from each other, they are genuinely separate destinations reached by separate paths. Switching between them is a meaningful action rather than a cosmetic one, which is the single most useful response to a path problem.

Changing paths is not something going wrong. It is ordinary behaviour and the system is designed around it. The reason to know about it is not to worry, it is to stop over-interpreting your own experience.

Specifically, it means a single bad session is not evidence about an address, a single good session is not evidence either, and a run of either one is a small sample of paths rather than a fact about a destination.

There are ways to influence path selection, and this board is not going to walk through them. They are the kind of adjustment that helps in specific circumstances and makes things worse when applied as a general habit, and a reference site is the wrong place to be nudging people into changing defaults.

What is worth saying is that the defaults are chosen so that everybody looks alike, and that being unremarkable is most of the value on offer. Any change that makes your setup distinctive costs something that is hard to see and hard to get back.

Because the path underneath you moves, a symptom you noticed ten minutes ago may be impossible to reproduce. That is frustrating, and it has one practical consequence worth acting on: if something unusual happens, note it at the time rather than intending to look into it later.

What is worth noting is small. Which address you were on, what you saw, and whether ordinary browsing was affected at the same moment. Those three facts are enough to distinguish most of the categories on this board later, and none of them survive an hour in memory.

What is not worth noting is a timing. A duration measured once, on one path, is a fact about that path and nothing else, and writing it down tends to turn it into a baseline you compare everything against. That is how people end up with a firm belief that one address is slow, which the distance measurements on this board exist partly to argue against.