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

SV_MINUPDATERATE

CS:GO

This command sets the minimum update rate for the server. This can be used in combation with the sv_mincmdrate command to change the server's tick rate (e.g. to 128 tick).

Syntax
sv_minupdaterate [Tick Rate]

Description

This command sets the minimum update rate for the server. This can be used in combation with the sv_mincmdrate command to change the server's tick rate (e.g. to 128 tick).

Syntax And Arguments

sv_minupdaterate [Tick Rate]
Tick Rate Your desired minimum update rate, e.g. 128 ticks per second.