How to reduce tween lag of big model on server side

I have tried to use a tween service on the script since I want all players to see a difference made by a player when he moves for instance. I recognised that when his box becomes bigger the tween is getting laggy and I have no idea how would I reduce this lag. I had in mind changing the maximum size extension possible but I’d like to keep it like this if possible. Here is my example of what exactly is happening:



When a player’s box is small tween works perfectly. I have used this idea of tweening the model:

I am really going to appreciate any help if possible at this point.