Decided to test a scene of a current project with latest Corona 3 build. No changes to render settings.
Before even delving into any possible bugs here and there noticed two major things, which completely forced me to revert back to Corona 2, since do not have much free time to experiment with scenes.
Corona 3 RC2 seems to makes whole 3ds max menus to be unresponislbe and gray - when loading , when the render button has been pressed.
IR loading time is longer with Corona 3 than Corona 2.
Opening the very same scene with Corona 2 is faster than with Corona 3.
RAM consumption with Corona 3 is way higher - 20 % at loading and rendering same scene.
Scene has immense use of assets and most textures are native 3ds max bitmap, not corona bitmap. This could be the culprit here.
Attached two images showcasing the RAM consumption. Displacement has been disabled.