Thanks.
I assume that if it can run smoothly on some system with proper settings, code is not the problem.
I tested it on linux too, so I guess it makes no difference

So it is smooth with speed=240 and vsync on? But it is still the same for me with or without the print()
The print() was there to warn when dt is more than 1/60, And I noticed that it prints even without scrolling

OK this one has speed=240, vsync=1 and no print

If I keep going right non stop I see small stutters. Attached file rather simple. My assumption is it is the video card/driver.
I am just curious that whether anyone else sees the stutter. Use left/right arrow keys to go left/right respectively

Simple player movement with box2d. It is a little wrong but I hope it helps someone.

Tiled added parallax support recently, I modified STI a little to support it. -- Scale map to 1.0 to draw onto canvas, this fixes tearing issues -- Map is translated to correct position so the right section is drawn lg.push() lg.origin() tx, ty = tx or 0, ty or 0 for _, layer in ipairs(self.layers) ...

I dropped ATL. Now it uses STI

https://github.com/monolifed/luvarc -> platformer-sti

Work in progress pixel editor

Added undo

https://github.com/monolifed/luvarc -> astar
Since all the others was not really simple, I made this. It may help

A note: returned path is from destination to start