Describe the new feature: The current loading screen only contains a spinning circle. I think replacing it with a bar would be more informative, especially with slower computers / larger maps.
Proposal designs of the feature:

The loading bar seems a good design, but I would like to propose a second one just in case. Something similar to the animation that I saw from the Epic Games launcher: the image is the loading bar, the "unloaded" part is dark, and the "loaded" one is brighter. We can also keep the spinning circle in this case.

Load times will probably go down still, so this might end up being a non-issue.
Not sure if there's an ability to calculate the time of drawable loading
The load time will be reduced further, to the point a progress bar should not be necessary.
Most helpful comment
The loading bar seems a good design, but I would like to propose a second one just in case. Something similar to the animation that I saw from the Epic Games launcher: the image is the loading bar, the "unloaded" part is dark, and the "loaded" one is brighter. We can also keep the spinning circle in this case.