The software has some kind of deadlock in it

[waynezhang2021]

I am building a processor
There are lots of subcircuits, and recently the software suddenly started behaving strangely (becoming frozen when I drag anything and possibly recovering after a minute or two).
This is when I double click on a subcircuit:

When I go to task manager, it looks like this:

This is Chinese (If you can't read this, it just basically means the process is waiting for another thread in itself to do something)
I wonder if there is a deadlock or memory corruption or why it suddenly becomes so laggy?
You could try on this circuit:
CPU.zip
It's zipped because GitHub does not support .circ files.