We have a scientific software developed in Java using the Eclipse RCP.
One of our users is complaining about very slow startup times on a Windows Server 2016.
The server configuration looks good, 108GB RAM, so based on that I would discard slow hardware.
When the software is executed, it takes a while (sometimes 2-3 minutes) to actually open the program and sometimes the "Not Responding!" system error message is shown.
Running the software on Windows 10 I have seen that the "Antimalware Service Executable" process gets high CPU usage during the startup of our software, then it gets lower and the application UI is shown.
The application is signed using a globalising certificate.