Hi @motorsep
Without the hardware its not possible to actually test, but looking at the code when the plugin is initialised from the Build → GPU Lightmass plugin.
All the caches are initialised before the BUILD buttons are enabled
The tests are done to see if BUILD or START BUILD LIGHTING for Bake What You See.
Press Red X to exit each time try turning off View Real time off, may help, again I cannot test this as the code is so complex