youtube.com Home - YouTube

Mobile Usability

100/100

Good

Mobile Speed

55/100

Bad

Last tested: 2017-08-27

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youtube.com Mobile Speed: 55/100
youtube.com Mobile Speed Test Quick Overview

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 3 blocking script resources and 1 blocking CSS resources. This causes a delay in rendering your page.
https://m.youtube.com/yts/jsbin/mobile-blazer-nirv…hone-vflBXKLBQ/core.js
https://m.youtube.com/yts/jsbin/mobile-blazer-nirv…one-vflBXKLBQ/watch.js
https://m.youtube.com/yts/jsbin/mobile-blazer-nirv…BQ/logged_out_users.js
Optimize CSS Delivery of the following:
https://m.youtube.com/yts/cssbin/mobile-nirvana-phone-mangled-vfla_9N83.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://youtube.com/
http://www.youtube.com/
https://m.youtube.com/
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.
Only about 2% of the final above-the-fold content could be rendered with the full HTML response.
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:
https://i.ytimg.com/vi/Sxoc2Xp0jWE/hq720.jpg?custo…5CZfN9WXlpa47Bq8fy7t_0 (5 minutes)
https://i.ytimg.com/vi/qEN4K6yMlv8/sddefault_live.jpg (5 minutes)
https://i.ytimg.com/vi/BibBMBibTq0/hq720.jpg?custo…E751ZnlZpf2MlRemEF1Ocw (2 hours)
https://i.ytimg.com/vi/LGJjVSnydGs/hq720.jpg?custo…68Qw8_zMOo4Yv7dg5BqFyY (2 hours)
https://i.ytimg.com/vi/_PR7PHV8igM/hq720.jpg?custo…mFjxjc_lifegC-kxfpoTXE (2 hours)
https://i.ytimg.com/vi/nBPQXWgAOO8/maxresdefault.jpg (2 hours)
https://i.ytimg.com/vi/rQc8M2Dxwx8/hq720.jpg?custo…GKkDCiunhGxn09NA1aXW0w (2 hours)
Optimize images

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 5.5KiB (34% reduction).
Compressing https://yt3.ggpht.com/-6zYJjcwHf6s/AAAAAAAAAAI/AAA…rj-c0xffffff/photo.jpg could save 1.3KiB (40% reduction).
Compressing https://yt3.ggpht.com/-x3CU1CXklQI/AAAAAAAAAAI/AAA…rj-c0xffffff/photo.jpg could save 1.3KiB (31% reduction).
Compressing https://yt3.ggpht.com/-uaGL0zVHZA8/AAAAAAAAAAI/AAA…rj-c0xffffff/photo.jpg could save 1.1KiB (40% reduction).
Compressing https://yt3.ggpht.com/-qPcZ4X5VMgw/AAAAAAAAAAI/AAA…rj-c0xffffff/photo.jpg could save 1.1KiB (31% reduction).
Compressing https://yt3.ggpht.com/-7rhaW_8uYT4/AAAAAAAAAAI/AAA…rj-c0xffffff/photo.jpg could save 719B (27% reduction).

youtube.com Mobile Resources


Total Resources37
Number of Hosts11
Static Resources21
JavaScript Resources6
CSS Resources1

youtube.com Mobile Resource Breakdown