In some cases, it is because the footage from space agencies is slowed down. They have high speed cameras that are used to get data about everything that happens during the launch. These look slo mo when played back. But also, rockets are *huge*. Even if you have a lot of thrust, it takes a little while to accelerate all that mass to a high speed. Also, things that are very large, even when moving very fast, appear to be moving relatively slowly
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