MCPE-230090 – Camera Jitter / Mouse Input Summary

Issue:
Mouse camera movement in Minecraft Bedrock on Windows is jittery or jumps, despite perfectly stable FPS. The problem is only present with mouse input; controllers remain smooth. Severity varies depending on context (singleplayer vs. servers, chunk/entity loading, etc.).

Affected Versions:
1.21.120 and newer, including 1.21.124 and 1.21.130 Previews.
Downgrading to 1.21.114 improves smoothness but introduces minor input oddities.

Key Observations from Users:

• Issue appears after the GDK update.

• High refresh rates (120–240Hz) and high FPS exacerbate jitter.

• The problem is not caused by hardware, drivers, or settings: V-Sync, polling rate, G-Sync, frame limiters, and anti-aliasing do not fix it.

• Severity is context-dependent: heavier server loads make the jitter more pronounced.

• Mouse polling “feels capped” at 125Hz in some contexts, though FPS and polling are technically higher.

• Downgrading, lowering polling rates, or using controllers can temporarily mitigate the issue.

Technical Diagnosis:

• Likely a GDK mouse input processing problem, misprocessing relative movement per frame.

• Rendering pipeline mismanages camera movement under high FPS/load conditions, causing stutter or jumps.

• The issue is persistent and cannot be fully resolved by user-side tweaks.

Summary:
Camera jitter in Bedrock is a mouse input problem introduced by recent GDK changes. FPS is stable, hardware is fine, and the issue is context-dependent. Mitigation is partial at best; full resolution requires a fix in the input/render pipeline by Mojang.

Request:
Please investigate and address GDK mouse input handling to restore smooth camera movement across all systems and contexts.