Slow in, fast out
Slow in, fast out is the principle of entering a corner a little slower to set up an earlier, harder exit onto the next straight.
Also called: slow in fast out
Slow in, fast out is one of the oldest and most useful pieces of driving advice. Enter a corner a touch slower than feels heroic, get the car rotated and pointed, and you can go to throttle sooner and harder on exit. That exit speed is carried along the whole next straight.
It also leaves margin. A car entering too fast spends the corner fighting understeer or managing a slide, with no chance to accelerate until the very end. A car entering slightly slow has grip in reserve and options if something goes wrong.
It is a principle for learning, not a law. As skills grow, drivers carry more speed in while keeping the exit strong. But for a novice, a slight under-speed entry is almost always faster over the full lap than a heroic dive into the corner.
Prioritizing exits usually lowers lap time and leaves a safety margin for mistakes on corner entry.