The middle 'F' is running at full speed frame rate independent.

The left 'F' is simulating a slow frame rate but not frame rate independent.

The right 'F' is simulateing a slow frame rate but is frame rate independent.

Notice how the right 'F's rotation matches the middle one even though it is rotating at a slow frame rate.

The left 'F' is simulating a slow frame rate but not frame rate independent.

The right 'F' is simulateing a slow frame rate but is frame rate independent.

Notice how the right 'F's rotation matches the middle one even though it is rotating at a slow frame rate.