Aside from the reality that a user won't always know their connection is slow / has slowed (particularly when it comes to bad routing between server and client), this is also typically used in cases where you are utilizing XHR.
Given that they're done in the background, the browser won't indicate them being made outside of dev tools. If they're asynchronous, again ideally they will take place as quickly as possible. This is unfortunately not something that can be relied upon.
Comments
Aside from the reality that a user won't always know their connection is slow / has slowed (particularly when it comes to bad routing between server and client), this is also typically used in cases where you are utilizing XHR.
Given that they're done in the background, the browser won't indicate them being made outside of dev tools. If they're asynchronous, again ideally they will take place as quickly as possible. This is unfortunately not something that can be relied upon.