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Per the OP: mostly 2D and a little 3D, so moderate specs will do fine for the most part. For 3D work, a modest system will help enforce good modeling practices - appropriate level of detail, use of blocks for repetetive features, and splitting content into XREFs. I've seen users overwhelm their system with poor practices, get a new computer, and quickly reach the same point (and promptly blame the software). Many of our users are working in 3D with 8 GB RAM without much difficulty.
As for multi-threading its not an end-all, be-all solution to make things better. Most of the work in AutoCAD cannot be effectively split into independant operations, so there isn't much poor design in play.
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
How would that process break down into multiple simultaneous steps? Would the intent be that you can do other things in the drawing while the calculations are being done?
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
One of the problems with multi-tasking is each of the threads being used needs access to the objects. But that means the objects can be modified while they are being processed which can lead to very bad things. Its a very similar problem to database processing (which DWG files are a specialized instance of), where records have to be locked while being modified so another query doesn't modify them. Of course, if that record (object) is locked all other threads have to wait for access and you lose the speed benefits of multi-threading.
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.
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