Hello! I faced with a small but annoying issue. When I turn on the “Debug” checkbox
it looks like this Screen capture - 72bbac8aa8a760896a962a8cb91eb1ef - Gyazo
frequently blinking all the time
This does not look like a bug. This looks like a continuously firing collision. Physics simulation often does not ‘just work’. The way to fix is to, read the Defold manual, go to the Box2D website and read through that.
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I see the same visual glitch (continuous blinking). Is is probably due to the physics engine being updated with different rate then the rendering? Just a blind guess.
Anyway I can well live with it! 
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honestly, I didn’t do something special& I just follow this tutorial https://www.youtube.com/watch?v=F5XMemcAwmE&t=376s
In video it works well without any additions
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Also for me! Thank you! I was assuming my update frequency of the render set to 60Hz by default but it was not the case!