Seeing as this is the first post on google when I searched for “UE5 emulate lag”, I thought I’d mention this;
The Net PkgLag command mentioned above, is for the PIE based network emulation.
If you are connected to a dedicated server, check out the Console Commands For Network Debugging.
Notably, there are some for emulating lag such as:
NetEmulation.PktLag
NetEmulation.PktLagMin
NetEmulation.PktLagMax
NetEmulation.PktLagVariance
And a lot of others. I know this is an ancient post… Just want to help people find the right resources quickly.