Thank you for sharing the experience and I am very sorry for the issue!
If you encounter slowness right after clicking New, it's likely that Archicad is having problem accessing the license. If you use only Single license (whether it's hardware-based or software-based license), it's best to set only localhost to the Server Search List of Codemeter:
Open Codemeter Control Center, then click WebAdmin on the lower right corner
Configuration > Basic > Server Search List
Add localhost to theServer Search Listand remove all other entries
Also, make sure that Archicad is added into the exclusion list of Firewall or Antivirus program if it's relevant.
When it comes to NET license, it's a bit tricky to diagnose. In most cases, the communication was hindered by Firewall or Antivirus program, but in some other cases, Archicad simply could not reach the server. In these situations, I suggest asking the IT support from your company, or reaching out to your local reseller/support for further investigation.
I hope this helps you with the case. Feel free to ask if you have any questions!