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UCEERR_TRANSPORTOVERLOADED
UCEERR_TRANSPORTOVERLOADED is a Windows User Composition Engine (UCE) HRESULT. It indicates that the composition channel cannot keep up with the volume of pending graphics or visual-update traffic.
What to check for UCEERR_TRANSPORTOVERLOADED
- Profile high-frequency property changes, animation, layout invalidation, and rendering callbacks.
- Coalesce frequent updates and avoid generating work faster than the rendering channel can consume it.
- Check for a blocked renderer or GPU issue if the workload is normally modest.
Microsoft guidance for WPF render-thread failures
Diagnostic discriminator: Measure pending composition traffic and queue pressure while keeping the channel/version unchanged. This status means the transport exists but cannot keep up with queued work.
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