Katy swims faster when there are large crowds at the swim meet than when she practices and no one is around.Her faster times may be due to:

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Katy's faster times at swim meets when there are large crowds suggest social facilitation, whereby the presence of others increases her arousal and enhances her performance on simple, well-learned tasks like swimming. This is in contrast to social inhibition, where the presence of others leads to a decrease in performance on tasks that are more complex or require more conscious attention. Deindividuation and diffusion of responsibility are not relevant concepts in this scenario.

Katy Swims Faster When There Are Large Crowds at the Swim