Currently, when an action is performed (example: drawing a pixel), the action is re-performed when it's initially done and when it's re-done (after being undone).

If someone was to create a big canvas, fill it, then undo it, re-do it, the program might lag, as it's being re-performed every time.

To aid this, an action should be "cache-able", meaning that whatever the action does is saved to

Make time remaining label appear/disappear whenever a render starts and stops.

i.e. visible when underway, invisible when not.

Simple ui change but makes it look nicer 👍