Are there any performance difference between modifiers?

[Maksimka101]

Should I use the $with.padding instead of the $box.padding or $with.sizedBox instead of $box.height?

[leoafarias]

@Maksimka101 it is the same difference as adding.

Padding(padding...) vs Container(padding: ...)
or SizedBox vs Container(height:...)

The Container widget adds the Padding widget internally, so it just changes the order of the widgets in the tree. So in the case of $with.padding, or $box.mod.padding, they will behave more like a margin than a Container with padding.

Let me know if that makes sense.

[Maksimka101]

So 'with' variant is more performant as Padding is a little bit more performant than Container

Why did you added with.padding and with.sizedBox when you already have box alternatives?)

[leoafarias]

@Maksimka101, the box is equivalent to the Container. Modifiers are just references to other widgets. There are cases where you want more control over the composability.