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I know this has been discussed here before, perhaps many times, but I have to vent my anger ...
Assy1 is 1,733 kb. Now, use assy1 and make (higher) assy2 - assy2 contains ONLY assy1 and nothing else - after FIRST save assy2 is 3,193 kb. If I do NOTHING and just re-save assy2 I get 6,407 kb...