Hello @Pablito Hope you are doing good.
Thanks for the swift response. 
I agree that it’s a old topic but it is occurring for me more than a month recently. Thus looking for help and found this topic in the past. Please check below for the details you asked.
Studio & Orchestrator Version : 2020.10.2 - Licensed.
We have 2 server for Development with one bot each, Currently in one I am facing issue which has no internet(As per requirement). And I tested the same process which takes 20mins in the “server without internet” to the “server with internet”, Luckily it opens the process in less than 1 min in the server with internet. So I guess some problem with the studio in the server without internet. I checked the logs and found that many packages are failed to load and went in timeout which caused this 20min drag. If you want, Let me know I will share the exported output logs for both the server for the same process
And lately I have added internet to the server which doesn’t have internet and tried opening the process, It worked fine. So the issue is when internet is not there it takes 20mins to load up. Please advice to overcome this issue as we need one server to be without internet.
I tried deleting the project.json file and opened the project and added the required dependencies, Still the same issue.