Freezing when I create roads in very dense areas

when I add a road in areas where there are many buildings, the game freezes for many seconds.
My PC is composed like this:
MB: Gigabyte G1.Sniper.5
CPU: Intel i7 4770K
SKV: Radeon RX 5700 XT

I’m having the same problem. I’m pretty late game (research is done, ship is 75% done) and I’m having a problem when I replace a road with a different kind. A full 0.5-1 second freeze.

CPU: i7-10750H

The forum won’t let me upload the file so I’ll email. It’s called Sappho Alpha. I’m reporting a second bug (my original reason for logging on tonight) in another post but same file.