it's the speed of the tick. what the tick does it loop the server for stuff (so players, items, events, etc)
so faster it is faster the loops will be so more fluid will be the movements of animals/players BUT (see under) correct me if i'm wrong but i think it's:
tickrate = 10 => 10 ticks per second (default) tickrate = 20 => 20 ticks per second
incleasing the tick rate will: use more CPU & resources so if your server can't handle it (or rust can't handle it) will create huge lags because the
server will be overloaded decreasing the rick rate will: slow down all informations, so players, animals will be less looped making all the movements be unharmonic.
so ... yeah ... carefull changing that because by increasing / decreasing it you could just create more "lags".
