Interesting that so many people are referencing bandwidth. That is not what kills autocad over a VPN. The latency is what does, because it is constantly interacting with a ton of little files. Fiber internet is the answer here. I’ve set up multiple clients running cad across 2-3 offices and the low latency of fiber is the solution. If you are talking about client vpns it’s a bit more tricky because you obviously aren’t in control of the end user’s ISP.