Okay, tested your file.
This lag you have is normal in this level. It happens with one type of japanese armour. The moment you nail it with your AT infantry the lags also gone.
So you are right, somewhere the scripting goes wrong for certain type of hardware combo's (not all combo's have this problem somehow) but ranging the scale of min to max hardware and win XP to Win 7 I get this problem and not only me btw.
Attached the file where I just nailed the armour see if it helps you. Then just reload your old and bare with the wait. The rest of the levels gets better but you'll still suffer from it from time to time.
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