DefaultEngine.NetEmulation.ini

UE Latency Kit v0.1.0 · 40 lines · INI · MIT license

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1	; Copyright (c) 2026 Reignance Studios. MIT License, see LICENSE.
2	;
3	; Paste the section you want into Config/DefaultEngine.ini.
4	; Packet simulation is compiled out of Shipping builds, so test with
5	; Development or Test packages. Values apply to every connection the
6	; process makes, on the server and on clients.
7	;
8	; Pick ONE profile. Or leave the file alone and pass the same values on
9	; the command line with Scripts/Run-Clients.ps1 -Preset <name>.
10	;
11	; PktLag is per process: the server and the client each delay what they send,
12	; so the round trip is about 2 x PktLag. PktLag below is already halved;
13	; PktLagVariance is per process too, the same values Run-Clients.ps1 uses.
14	;
15	; Keep PktOrder=0. In UE 5.x a non-zero PktOrder sends packets before the
16	; PktLag step runs, which silently turns the lag off.
17
18	; --- Profile "average": ~60 ms round trip, a home connection to a nearby region ---
19	[PacketSimulationSettings]
20	PktLag=30
21	PktLagVariance=10
22	PktLoss=1
23	PktOrder=0
24	PktDup=0
25
26	; --- Profile "bad": ~150 ms round trip, cross-region play, the Steam review case ---
27	; [PacketSimulationSettings]
28	; PktLag=75
29	; PktLagVariance=30
30	; PktLoss=3
31	; PktOrder=0
32	; PktDup=1
33
34	; --- Profile "awful": ~250 ms round trip, mobile hotspot. If it survives this, it ships ---
35	; [PacketSimulationSettings]
36	; PktLag=125
37	; PktLagVariance=60
38	; PktLoss=8
39	; PktOrder=0
40	; PktDup=2

Still desyncing in packaged builds?