L4D2
There are hidden cvars. Use
sm_cvar
Code:
"sv_hibernate_when_empty" = "1"
FCVAR_DEVELOPMENTONLY
- Puts the server into extremely low CPU usage mode when no clients connected
"sv_hibernate_postgame_delay" = "5"
FCVAR_DEVELOPMENTONLY
- # of seconds to wait after final client leaves before hibernating.
"sv_hibernate_ms" = "20"
FCVAR_DEVELOPMENTONLY
- # of milliseconds to sleep per frame while hibernating