Invincible speed margins and battlecruiser control

How much would faster Invincible, Lion, Queen Mary, and Tiger speeds change British battlecruiser design and tactics?

One or two extra knots would change little. A much larger margin over the battle line would let a battlecruiser force dictate range, pace, and engagement terms.

Speed can control a gunnery engagement as well as define a ship's performance. A one- or two-knot increase would sharpen the contrast with German designs, described here as closer to second-line battleships, without transforming the Invincibles' tactical role. A three- or four-knot margin would let the faster force choose range and pace. Starting the Invincibles at about 28 knots, roughly seven knots faster than the battle line, would let them dictate the engagement far more completely.