"sped up" meaning in English

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          "ref": "2025 December 24, Tim Dunn, “Railways and film: the perfect match”, in RAIL, number 1051, page 54:",
          "text": "Notable examples include The Titfield Thunderbolt (1953), […], and The Great St Trinian's Train Robbery, a slightly bonkers 1965 comedy using the Longmoor Military Railway and obviously sped-up footage.",
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