Thank you. I'd like to tell you about my new discovery that during the stalling process, the computer is used as an idle process with almost no CPU loss. And I've compared the standard renderer to corona renderer with the same cartoon shader, and the standard renderer doesn't stall. I'm not sure if it's the effect of other programs on C4D, the effect of one of my plug-ins on Corona Render, or the compatibility of my hardware itself with Corona Render.
I'll try to find out why. Thanks again for your help!