Compile stuck at 25 mb memory

I’ve built UE4 succesfully from source and now I want to “Debug->Start new instance” to open the editor with the setting “Development Editor” at “64 bit”.

But after a few seconds visual studio is stuck at 25 mb of process memory and stays there.

The editor starts just fine when I use the setting “Debug Editor”, though.

Does anyone know what could be the problem?

It seems that the problem was Commodo Antivirus. Exiting Commodo solves the problem.

I’m seeing this exact same problem with the “Development Editor” profile. The only antivirus software I have is Windows Defender, and even disabling that doesn’t fix the problem.