How to Fix Physics Jitter in Unreal Engine

Jittery Unreal physics usually means the simulation step is too coarse for the motion. Substepping gives it finer steps and stabilizes it. Here is how.

How to fix it

1. Enable substepping

Turn on physics substepping and set a max substep delta and count. This runs multiple smaller physics steps per frame at high speeds or low frame rates, smoothing motion that a single coarse step makes jittery.

2. Keep physics in the right tick

Drive physics-affecting code from the physics tick or with proper delta handling so forces are applied consistently. Mixing variable-rate updates into physics reintroduces jitter.

3. Give fast and heavy bodies enough steps

Very fast objects and large mass ratios stress the solver. Adequate substeps and solver iterations keep them stable; too few produce the jitter and penetration you are seeing.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Unreal Engine error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.