小米是 ScaryBooks.com 的营销者。根据 Google 用户流报告，该网站有很高比例的用户在结账时放弃购买商品。她认为原因在于结账流程要求用户在每次购买时都填写所有送货信息、结算信息和信用卡信息。 ScaryBooks.com 可以借助哪种 Google 解决方案大大提高结账速度？

One-tap signup significantly improves checkout speed by allowing users to register or log in with a single click, often leveraging existing Google account information. This eliminates the need to repeatedly enter shipping, billing, and credit card details, directly addressing the pain point of a lengthy checkout process. Google AI is a broad set of machine learning tools, not a direct solution for checkout speed. Google App Engine is a platform for building and hosting web applications, not a user-facing feature for checkout optimization. Progressive Web Apps (PWAs) enhance web experiences but don't inherently streamline the registration and payment input process in the same direct way as one-tap signup.