"Working" preventing an end user from typing on a form?

te only time I have seen that is when there is validation on the field. Is that the case here?

Are any of your rules in the with() section of your form constantly running some logic that cross with your fields? I would 1st suggest checking the form with performance view & see if any variables, parameters, rules, etc. are degrading the performance of your form.

No, neither case applies. There is no with() and no validations, and there are no performance issues that we can see on our end with this form. When I attempt to reproduce locally, the "Working" message doesn't even appear when working on any fields on this form. I have logged a support case to further troubleshoot.

sounds network specific

Do you have any text fields with refreshAfter set to "KEYPRESS"? That would explain the "Working" message after each keystroke, but there is definite another issue involved, if the message and the pause disrupted the user.
You should also try to isolate the issue by asking the particular user to login from a different computer and try to do the same task. So you'll know for sure if the problem is with the user account/role or the machine, or neither.

@jasonr411 random thought, might not apply.

Does the user have any browser extension/add-on/plugin installed that sends a request after each field e.g. I have seen AJAX requests being made by add-ons such as Grammarly and others, because they need to validate with their servers each time.

We also think it's likely network specific. We do have the textfields set with refreshAfter: "KEYPRESS" - however that shouldn't cause it to be this slow for this one user, and I'm not sure how it would disrupt the user either. (Although the saveInto does update a value within an array, so it's not the simplest case - but it's never caused an issue before now with any other users).

Problem with these sorts of bugs is that it can be a lot of things....

What browser are they using? The Javascript engine on the browser maybe old. Plugins could be causing issues.

Their computer could also be old which maybe causing issues.

Then there is network. What fields exactly is causing the issues and what are you trying to do in the background?

It was a browser/client issue. It has not recurred today for the user, so it was likely fixed by a restart.