NB! It seems this console command is not compatible with CS2.
Command Profile

NET_FAKEJITTER

CS:GO

This command will will cause your client to "jitter" (fake lag) for the specified amount of milliseconds.

Syntax
net_fakejitter [Milliseconds]

Description

This command will will cause your client to "jitter" (fake lag) for the specified amount of milliseconds.

Syntax And Arguments

net_fakejitter [Milliseconds]
Milliseconds The amount of milliseconds to fake jitter for. 1000 = 1 second.