Having trouble with heavy lag

Hi everyone, I have a small issue but Im not sure what the reason for it is. I have limited space on my computer but I have a 36tb server setup like an external harddrive through the network. My server is hardlined to the router and my computer is wireless. I was able to load and run the engine off of my pc but load projects stored there and was also able to store my vault there as well but the issue of course. I seem to have an issue though with the library. I have a large collection of things I am adding to a project but it seems to hang up on the part that says “cleaning up”. What is the purpose of this and why would it sit there for so long? I understand my net speed is less than average but it almost seems like it is stuck there. running 2.5 and 2.6 thanks!