# Physics constrain lagging behind

**URL:** <https://forums.unrealengine.com/t/physics-constrain-lagging-behind/2564279>\
**Category:** Character & Animation\
**Tags:** simulate-physics, physics-constraint, physics-asset, unreal-engine, Physics, question\
**Created:** [June 18, 2025, 11:22am UTC](https://forums.unrealengine.com/t/physics-constrain-lagging-behind/2564279 "2025-06-18T11:22:17Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![WillyG99](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@WillyG99](https://forums.unrealengine.com/u/WillyG99)\
**Post date:** [June 18, 2025, 11:22am UTC](https://forums.unrealengine.com/t/physics-constrain-lagging-behind/2564279/1 "2025-06-18T11:22:17Z")

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Hi! I have 2 bones on my grenade, main bone is kinematic and the ring/pin is simulated. Between them is a constraint, this constraint has all x,y,z positions locked. However in-game while moving fast the bone lags behind. Why doesn’t the constraint lock the position of the ring/pin?

I tested the relative position of the actual ring, and it’s 0,0,0 at all times. So it doesn’t seem to actually move. Maybe it’s just not synced or something?

 ![Screenshot 2025-06-18 125829](https://d3kjluh73b9h9o.cloudfront.net/original/4X/0/b/7/0b7014f1792295878e7afe3260a50bd21fb815f4.jpeg)

 ![Screenshot 2025-06-18 125807](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/3/e/63e87fe13990b933b41833b45c660522e885054b.jpeg)