Client movement stuttering on server in Steam multiplayer (UE5.5, Advanced Sessions)

Development Programming & Scripting Multiplayer & Networking
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Hi everyone,
I’m developing a Steam multiplayer game in Unreal Engine 5.5 using the Advanced Sessions plugin for session management.

When I test the packaged build through Steam (server hosting and client joining), both players see themselves moving normally.
However, the server sees the client “stuttering” or freezing for a moment, even though the client’s own view looks smooth.

I tried using the Smooth Sync plugin, which fixed the desync issue, but it introduced other replication and transform update problems in my setup — so I’m looking for a native Unreal-based solution instead of third-party sync tools.

What’s the correct way to make sure the server sees the client’s movement smoothly (without lag or teleport-like stutters) when using Unreal’s native replication system?
(Tested on PCs with RTX 3080 and RTX 4070 GPU - Internet speed: 1000 Mbps (fiber))

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Server looks like its hitching almost like the client is firing off too many updates and it can’t keep up.

If you’re using Character Movement Component (CMC) you need to understand its built in client-side prediction. Check the docs on this for a detailed network flow.

ClientSendMoveDeltaTime (Engine/Config/BaseGame.ini [GameNetworkManager])
This defines the movement update frequency at which clients update the server. Default is 60Hz.