A few thoughts come to mind:
1. 3 months is about the time that you can expect to see proficiency, not mastery, which can take 1000 hours or even significantly more. I've seen discussions by CAD managers of almost every major program saying that they usually see understanding of a program in about 3 months, 6 months to get up to speed, and a year for full mastery. You may be too hard on yourself.
2. Your hardware may be frustrating your efforts a bit. It may be fine..., but a faster processor and more RAM might change your experience. And are you using multiple monitors, which can have a big impact on overall productivity? If I had to produce a major project on a laptop, I might shoot myself first.
3. You seem overly quick to dismiss shortcuts. I've found that many of the significant time-saving features are pretty well buried, and are not obvious. I'm not talking about keyboard shortcuts, although there are usually improvements available there. (e.g. I have ALT & CTRL keys mapped to my mouse thumb buttons, so almost everything is a one key command on the keyboard, and I'm starting to get into voice recognition for writing text.) I'm talking about things like context menus, full use of snap point options, guide line segments, full use of graphic overrides and renovation filters, and putting some serious time into creating and organizing Favorites.
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10