Firefox shows a spinning loading wheel during page loading time.

Firefox在加载页面时显示一个旋转的圈圈。

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Lazy load all images without configurations. It helps to decrease number of requests and improve page loading time.

延迟加载所有图片，无需配置，有助于减少请求数，提高页面加载速度。

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While this might make your website look cutting edge, it can also have a negative impact on page loading times, especially if a lot of people are viewing the site at the same time.

这些方面让你们的网站看起来高端，在网页下载次数方面，特别是如果很多人同时浏览网站时却有负面效应。

youdao

To answer your queries, loading time from the live tile menu to the top tweets page above is approximately three seconds, while scrolling is basically identical to the perfection available on WP7's own apps.

ENGADGET: Official Twitter app for Windows Phone 7 goes live (update: hands-on)