Literal translation: Understanding (or good sense) is a slowpoke.
SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. Compare:
Understanding comes with age. | Der seykhl kumt nokh di yorn. | .דער שׂכל קומט נאָך די יאָרן
SOURCE: Furman, Yidishe Shprikhverter un Rednsartn
The truth is a slowpoke. | Der emes iz a krikher. | .דער אמת איז אַ קריכער
SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh