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videospeed
HTML5 video speed controller (for Firefox). WebExtensions port of Video Speed Controller Chrome extension. (by codebicycle)
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
TL;DR: faster playback translates to better engagement and retention.
Average adult reads prose text at 250 to 300 words per minute (wpm) [1]. By contrast, the average rate of speech for English speakers is ~150 wpm, with slide presentations often closer to 100 wpm. As a result, when given the choice, many viewers speed up video playback to ~1.3~1.5 its recorded rate [2] to compensate for the difference.
Many viewers report that accelerated viewing keeps their attention longer: faster delivery keeps the viewer more engaged with the content [3]. In fact, with a little training many end up watching videos at 2x+ the recorded speed. Some studies report that after being exposed to accelerated playback, listeners become uncomfortable [4] if they are forced to return to normal rate of presentation.
[1] https://www.domtar.com/en/resources/paper-advocacy/paperbecauser
[2] https://www.microsoft.com/en-us/research/publication/time-compression-systems-concerns-usage-and-benefits/?from=https://research.microsoft.com/en-us/um/redmond/groups/coet/compression/chi99/paper.pdf&type=exact
[3] https://www.enounce.com/docs/BYUPaper020319.pdf
[4] http://alumni.media.mit.edu/~barons/html/avios92.html#beasleyalteredspeech
Source: https://github.com/codebicycle/videospeed#the-science-of-accelerated-playback