anyway it only proves that CW7 can run game with 1 simple sprite and pipes with bullet behavior (I guess). It would be nice to see something with more objects, behaviors and so on.
I thought I was doing something wrong in my game. That it's too demanding and not optimized, that I'm using too big and too many sprites and so on, but even after I removed all parallax backgrounds and cut down all sprites creating too a minimum, the screen jerking and lagging was still present (in crosswalk 10). When I tried the cw7 shell the sprites and background jumping stopped and the fps went up by 10%. It's not about fps, when running it on a low end device, I can see it's not smooth, but it's playable because it's consistent. In cw10 all objects with bullet behavior abruptly jump and there even seems to be an input lag.
After making the test game it's clear the problem is in cw10+. I believe crasswalk is good or let's say, will be. I just don't have time right now to wait for that, unless they can fix it in couple days and I'll switch to CJS.