Pleaase start a new test galaxy with all mods disabled - do you still get this?
[DEV TEAM] 3.10.2 "Pyxis" Steam Open Beta
Hello! We've just released an update to the Stellaris Test branch on Steam, containing the 3.10.2 patch that is currently in certification for release later this week. Of particular note, this release includes a fix to a common MacOS crash (that...THEN
Right-click on stellaris.exe, properties, compatibility. Tick "disable fullscreen optimizations" untick every other box in that dialog, Apply, and exit.
Then in the launcher Game Settings menu, select the fullScreen display mode, Vsync off, refresh rate 60. And start another new galaxy. Is that any better?