2

What is considered a feasible representation of a value that has yet to be loaded? Would something such as the -- placeholder be sufficient or is there something else that is better suited / widely know for the user?

Example:

enter image description here

6

If the value will populate, set your users expectations where they will see the value appear. Let them know the system is working to return the value...

Give the user the feeling of control (system status)

From first glance, using the -- makes the value look Null, or irrelevant. If the application will certainly deliver a value, wether that's 0% up to 100%, it's crucial they be shown the system status.

Jakob Nielsen emphasizes Visibility of System Status:

The system should always keep users informed about what is going on, through appropriate feedback within reasonable time.

How to show status

Here you have some choices. You could:

enter image description here

NOTE: I didn't mention a percentage loading bar, since your final value is a percentage itself.

-1

What is considered a feasible representation of a value that has yet to be loaded?

This is commonly referred to as a "loader" image, most commonly done with .gif files.

A LOADER

If you use google image search and/or any of the image/design sites you'll find more examples than you can imagine, and probably something ideal for what you're doing.

Type in the following to an image search:

loader gif

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