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

MP_DO_WARMUP_PERIOD

CS:GO

This command sets whether or not there is a warmup period in games. Default is enabled (1). This does not apply to offline with bot games, use the mp_do_warmup_offine (that's not a typo) command instead.

Syntax
mp_do_warmup_period [0 / 1]

Description

This command sets whether or not there is a warmup period in games. Default is enabled (1). This does not apply to offline with bot games, use the mp_do_warmup_offine (that's not a typo) command instead.

How To Use mp_do_warmup_period

  1. Enable the developer console in Counter-Strike settings.
  2. Open the console with the tilde key (~).
  3. Enter mp_do_warmup_period [0 / 1], replacing bracketed arguments with the value you want, then press Enter.

This legacy command is not currently listed as compatible with Counter-Strike 2.

Syntax And Arguments

mp_do_warmup_period [0 / 1]
0 / 1 Enter 0 here to disable the warmup period. Enter 1 here (default) to have a warmup period before the match.