Var.: Что скоро, то и не споро (то хворо)
Cf: Good and quickly seldom meet (Am., Br.). The greater hurry, the worse the speed (Am.). Haste makes waste (Am., Br.). Quick and well-done do not agree (Br.). Things will never be bettered by an excess of haste (Br.)Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.