My young daughter likes watching MasterChef junior.
On the particular episode she watched most recently, they had a team pizza making challenge. The pizza has to be built and cooked correctly to count. However, of the three teams, they nearly all had many improperly prepared pizzas. Only about a third of the pizzas were made correctly.
Why?
They were flustered. The judges on the show were screaming “Fast! Fast! Hurry! Oven is empty!”.
While these are only children, this was a bold example of life. When you are doing something new, your internal monologue can create the same feeling. If even one of the teams had a leader with the maturity to say, “I know this is a contest to go the fastest, but the first priority has to be correct, then fast comes after.” They could have gone half the speed of the other teams with 100% success rate on the pizzas and won first place.
This is true for adults at jobs, in business, as artists, etc.
Half speed works as a good starting point. Find success. Increase velocity. Repeat.