BenWeno
March 25, 2026, 6:06pm
1
Hello, I recently upgraded my nDisplay project to 5.7 and I’m seeing some pretty bad hitching every few seconds only when I run it through nDisplay in a packaged game. I’ve tried just launching an empty scene in my project and see the same issue. I also re-installed the engine, made a new empty project with a simple nDisplay config and am seeing the same thing. Any ideas what could be causing this?
Here’s a screenshot of the hitch in a unitgraph:
And in unreal insights it appears as “RenderGraphExecute - Slate” if I’m reading it right:
BenWeno
April 28, 2026, 7:58pm
2
It doesn’t seem like the latest patches have fixed this. I have noticed there’s some new logs since 5.5 related to failing socket connections:
[2026.04.28-19.22.47:731][ 31]LogUdpMessaging: Error: Sender FUdpMessageProcessor.Sender: SendTo failed (destination: 10.10.6.61:9030) (SE_NO_ERROR)
[2026.04.28-19.22.47:967][ 45]LogUdpMessaging: Warning: FUdpMessageProcessor::ProcessPingSegment failed to send ping segment 127.0.0.1:53991.
[2026.04.28-19.22.48:145][ 56]LogUdpMessaging: Warning: FUdpMessageProcessor::AcknowledgeReceipt failed to send 127.0.0.1:59001.
[2026.04.28-19.22.48:145][ 56]LogUdpMessaging: Warning: FUdpMessageProcessor::AcknowledgeReceipt failed to send 127.0.0.1:59001.
[2026.04.28-19.22.48:146][ 56]LogUdpMessaging: Error: UpdateSegmenters, Socket error detected when communicating with 127.0.0.1:59001, Banning communication to that endpoint.
I’ve tried allowing those ports through the firewall, but I still get the errors. This is all running on a single machine with one node.
dev_da
May 22, 2026, 12:22pm
3
I have the same issue, the hitches are every cca 4s and it is caused by (failing) attempts to comm. via UDP.
Removing these params from the cmd line helped for me (I do not need UDP or Cluster):
-messaging -RemoteControlIsHeadless -UDPMESSAGING_TRANSPORT_MULTICAST=“230.0.0.1:6666” -UDPMESSAGING_TRANSPORT_UNICAST=“127.0.0.1:0” -UDPMESSAGING_TRANSPORT_STATIC=%UDP_MSG% -CONCERTRETRYAUTOCONNECTONERROR -CONCERTAUTOCONNECT -CONCERTSERVER=“Switchboard_MU_Server” -CONCERTSESSION=“MU_Switchboard” -CONCERTDISPLAYNAME=“Node_0” -CONCERTISHEADLESS
