Hugh Jackman shared the “85% rule” in his podcast with Tim Ferriss where he observed that giving your 100% to a work gets you less productive compared when you are relaxed. Tim agreed that in most activities, being overly tense works against giving your best performance. Ever feel that you get fewer things done when you are burned out and your creativity doesn’t flow straight to your head? We have to learn how to be more patient with ourselves and have time to relax to bring out our best.
Source: https://eugeneyan.com/writing/when-giving-your-100-gets-you-less-than-85/