<function name="Tick" parent="GM" type="hook"> <description>Called every game tick. <page>engine.TickCount</page> is guaranteed to be different between each call. Server side, this is similar to <page>GM:Think</page> (See that page for details). The default tickrate is `66.6666` (16 millisecond intervals). It can be changed via the `-tickrate` [command line option](Command_Line_Parameters). The default tickrate is `66.6666` (15 millisecond intervals). It can be changed via the `-tickrate` [command line option](Command_Line_Parameters). See <page>engine.TickInterval</page> for a function to retrieve this data at runtime. <note>This hook **WILL NOT** run if the server is empty, unless you set the <page>ConVar</page> `sv_hibernate_think` to 1</note></description> <realm>Shared</realm> </function>