For both reducing the tick load and for more sensible usage could the ladders be made into a vehicle type entity and listen to the vehicle use event to change surfaces instead of constantly ticking? Removing the on_tick callback would be fantastic if that is the only part using it as well.

Also using a combo of a no-distance radar and a chest to transport items between surfaces would significantly reduce latency as well. The fake radar could charge in a second or so and listen to the radar tick event and operate on that if it is your fake radar, can also reduce lag.

valid ideas, if you can implement the enter to use ladders idea I will happily pull.

I just pushed an update to you on Github.
All ladders (Access shafts) are now vehicles.

Yeah, thanks Zinal, really appreciated it. I had no idea how to go about it and you did an amazing job with that.