Translated reply from the licensee:
I tested the issue using 4.4.3 with its language set to Japanese and then English, and got the same result from both. Though I had added nothing to the Blueprint, the compilation time increased every time I clicked the compilation button.
However, when I tested it again just now, I found the issue arises more often in compiling a Character class while the degree of the problem is less severe in compiling a Controller class and almost no issue occurs with a HUD class.
Additionally, when I tested it with all of the nodes in the event graph of the MyCharacte in a Blueprint Third Person template removed, the compilation time seemed to continue increasing. So the cause may be the base class of the Character.
Currently, I think it’s helpful if you could make known to Japanese users how they can workaround this as suizenji suggested.
Thank you.