Copyright © 2026 Unity Technologies
Thank you for reporting a bug to Unity. We have reviewed the issue carefully, and in this case, the team is unable to prioritize fixing this bug. There are a number of reasons we make this decision, including the impact and severity of the issue across our user and customer base, and the possibility that future plans may solve the problem in a different way, or that a workaround for the bug may be available. Today we will be closing this case. Thank you again for taking the time to report this issue, and please let us know if there is anything else that changes the impact or severity of this issue.
Steps to reproduce:
Actual results: The cursor is laggy
Expected results: The cursor moves smoothly
Reproducible with versions: 6000.6.0b6, 6000.6.0b8, 6000.7.0a3, 6000.7.0a4
Not reproducible with versions: 6000.0.81f1, 6000.3.21f1, 6000.5.8f1, 6000.6.0b5, 6000.7.0a2
Tested on (OS): Windows 11 Pro (25H2)
Not reproducible on: macOS Tahoe 26.3.1
UPDATE:
This issue is a side-effect of a feature change to add mouse wheel scrolling functionality during a Drag-and-Drop operation in response to this feedback.
Windows doesn't automatically dispatch WM_MOUSEWHEEL events while dragging, and to enable this functionality a mouse "Hook" is required. Unfortunately, the hook
carries a perf penalty causing mouse lag during the drag. Although we're able to optimize the input processing and eliminate the worst of the lag, we can't completely
fix it without a major re-work of the Win32 integration.
As a trade-off, we decided mouse wheel scrolling while dragging is more important than (minor) mouse movement lag.
Issues you vote on will appear here