[luciodale]

Good points.

1) I thought of giving an easier to read example. I just moved the example to react, so the snippets actually match exactly what's going on in the background.

2) It is true! Though, using shadows on the optimized code doesn't slow it down. I added more toggles to test same effects on transform and top/left implementations.

3) I think it's still interesting to start with some thought and then observe that in practice things are different really. In fact, thanks for all the feedback, as it made me go back and do more investigation.

If you don't mind you can give the article a second look now :)