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Growth spreads out. it may seem slower, but it's adding as much plant mass as before, but spread out over many growth nodes. After you cut it, it takes a second. The taller ones will quickly dominate and pull most resources and exhibit most new growth after that. growth does speed up almost exponentially over time, up to a point. You'll get more visibly vigorous growth all over soon. topping doesn't speed it up. it helps shape the plant.

They are looking good . When you top the plants it causes some stress and the plant will need to recover, normally takes about a week, after that your plants will start to grow rapidly again , bigger and wider