By default it’s always 0.0 for development purposes. New users would be even more stumped by jitter etc from a default fixed step.
Being performance technical if the actor doesn’t require ticking, then it should be disabled outright. Most actors don’t need ticking. I disable at creation, unless I need tick.
Overall each actor that does tick needs to be tuned to the lowest possible frequency you can get away with, without sacrificing on the end goal. What the actor does also has an impact on the tick rate. But in general they should never tick faster than the server if it’s multiplayer based.
e.g. a server controlled turret should at max tick with the server. Server is set to 30Hz, then that actor should be set to tick at 30Hz (preferably 15Hz in this example).