I have found one assembly drawing that is apparently bloated with garbage data.

Normally an assembly drawing has a size that could be the same or up the double the 3d  model it is referencing depending on complexity. That is our thumb rule.

We have a 20MB assy and its drawing inflated its size to 164MB.

 NO detailing mode activated.

If I save as it decrease of few MBs, but still over 150MB.

If I delete all