Hi Martin,
If you are not using Mendix Studio I would advise to disable Mendix Studio for the branch.
To do this:
- Go to version control → Manage Branch lines
- Select your branch and click Disable for mendix Studio.
- Restart your project. It should help significantly
Hope this helps!
Incase you are not using mendix studio then you can disable Mendix Studio for that branch line to solve the long wait.