I just re-tested in single Player, "City of hope" and there a really many kind of lags/freeze, often if any kind of animation or similar happens… I have terminated the game (Alt+F4) and I am happy to provide the log. Latest "lag was at in-game (City of hope) minute 3:25 for about 2-3 seconds. During this freeze the timer on top stopped and continued after Freeze/lag. Freeze does mean, the units are not moving, but i can slide through the game with the cursor without any issues. When Freeze ended Units are moving quickly to cover the lag period.
I do not think this issue is similar to the "crashes" issue you were referring too.
log.txt
For testing purposes, I just fully disabled any Sound, but this doesn't Change anything.