The only time I've ever seen it is on the level I created called "Clockworks"
Make a working solution for that level and see if you don't run into it there.
It seems to me everyone will have a slightly different point where they will hit this limit as everyone's systems are not identical.
My personal system will hit the limiter so to speak at around a 3/4 working "clockworks" level. The last 1/4 of the solution is where the limiter kicks in.
Mind you also that I haven't seen a level as large as Clockworks either. It's part of the reason I made it. I wanted the biggest size possible and I wanted to have to travel horizontally and vertically very long distances without the aid of rockets
-BFC