Xuetangx.com Site Title

学堂在线 - 精品在线课程学习平台

Xuetangx.com Meta Description

学堂在线是清华大学于2013年10月发起建立的慕课平台,是教育部在线教育研究中心的研究交流和成果应用平台,是国家2016年首批双创示范基地项目,是中国高等教育学会产教融合研究分会副秘书长单位,也是联合国教科文组织(UNESCO)国际工程教育中心(ICEE)的在线教育平台。目前,学堂在线运行了来自清华大学、北京大学、复旦大学、中国科技大学,以及麻省理工学院、斯坦福大学、加州大学伯克利分校等国内外高校的超过2300门优质课程,覆盖13大学科门类。

Xuetangx.com Test Results

xuetangx.com Mobile Usability: 98/100

Quick overview:
Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target <li class="el-carousel__i…ator is-active"></li> and 6 others are close to other tap targets .
...

xuetangx.com Mobile Speed: 16/100

Quick overview:
Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 2.1MiB (26% reduction).
Compressing https://qn-next.xuetangx.com/15755105401717.%E5%8D%93%E8%B6%8A%E7%AE%A1%E7%90%86%E8%80%85%E8%AE%AD%E7%BB%83 could save 377.6KiB (52% reduction).
...
Enable compression
Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.
Enable compression for the following resources to reduce their transfer size by 736.4KiB (71% reduction).
Compressing https://next.xuetangx.com/resources/js/0_c45fb1ba42cb66793230.js could save 672.7KiB (72% reduction).
...
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 5 blocking script resources and 1 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
https://s.xuetangx.com/resource/mathjax/MathJax.js?config=TeX-MML-AM_HTMLorMML-full
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Optimize CSS Delivery of the following:
https://next.xuetangx.com/resources/css/app.4fcbd31c4b79e6dc8cfa1eba0892206b.css
Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://xuetangx.com/
...
Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
http://storage.xuetangx.com/public_assets/xuetangx/bbs/cover/%E5%AD%A6%E5%A0%82%E6%97%A0%E5%9F%9F%E5%90%8Dlogo.png (expiration not specified)
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Prioritize visible content
Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.
The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.
None of the final above-the-fold content could be rendered even with the full HTML response.
Minify HTML
Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.
Minify HTML for the following resources to reduce their size by 154B (12% reduction).
Minifying https://next.xuetangx.com/ could save 154B (12% reduction) after compression.

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