Hey jinngonqui,
Have you been able to reproduce this is a new blank project, or are you testing the same project? This does not mean a new level or new project with the content migrated over. I mean a completely new blank blueprint or C++ project.
Just in case there are things you haven’t tried yet, take a look at the guide below.
Swarm Agent Troubleshooting Guide
Can you provide me with your ‘dxdiag’ so I can take a look at your machines specs?
Make sure your firewall is disabled for Swarm Agent as this can prevent your lighting from building as well.
Thanks,