Is it feasible to use delegates in the Tick() function?

[MagForceSeven]

@mrm_dev

my main concern is if or not delegates on their own are expensive to call?

No. The expense is from what is being called, not the delegate.

@mrm_dev

but if it’s performance that’s at stake I can go for it, what would you recommend in the long run?

To profile and fix the things that are slow in the profile. Other than that no one’s going to be able to say because only you understand the kinds of things you’re going to try to extend this way.

@mrm_dev

Also could you elaborate on “registering with a ticking subsystem” or perhaps an example if possible?

You can derive from UTickableWorldSubsystem or you can replicate that one using FTickableGameObject to make any subsystem tickable. Then you give it some functions to add and remove an Actor from a collection and you do the work on tick. Whatever code is deciding to add or remove from those delegates would instead add or remove from the subsystem. You do lose your pre/post tick behavior, but that’s probably better handled through the other tools available for tick ordering like tick groups.