I imported some models, but the size varies from one to another, so I need to adjust the scale property. In terms of performance and optimization, it would be better to keep the models with the default size (scale = 1)?
There are some circumstances where non-default or non-uniform scaling can affect performance, but it’s usually pretty low on my list of concerns. It’s rare that it becomes a problem.
By all means, try to make sure that your models are at scale with each other.