You have multi-threading out of the box on a per object basis, just set this in BP or somewhere in code on your tick-able object…
bAllowConcurrentTick = true;
Bam, multi-threaded per-frame actors or component ticks, seriously how hard was that?
They even block the render thread for you so that you can be sure your async tick is done in the current frame. Threads that block the game thread are of course not the place for long running processes, and just be sure your tick function doesn’t access anything it shouldn’t, and be sure to make sure to guard your critical sections with atomics, and keep your async thread out of places it shouldn’t be.
Welcome to the world of procedural programming.