为什么这个“慢网络检测到......”日志出现在Chrome中？ [英] Why does this "Slow network detected..." log appear in Chrome?

问题描述

我注意到这个 info log 开始出现在Google Chrome Dev（Version 55.0.2883.18 dev）中，我无法想象为什么。

检测到缓慢的网络。加载时会使用回退字体：

解决方案

这意味着网络速度很慢，而Chrome正在用本地回退替换网页字体（使用 @ font-face 规则加载）。

默认，在下载字体之前，使用网络字体呈现的文本是不可见的（不可见文本闪光灯 ）。通过这种改变，慢速网络上的用户可以在内容加载时开始阅读，而不是在几秒钟内查看空白页面。

• 相关的Chrome问题： https://bugs.chromium.org/p /铬/问题/细节？ID = 578029 。 （在3G连接中发生这种行为的更改于9月份降落;这应该是您收到该消息的原因。）


• 相关源代码： https://chromium.googlesource.com/chromium/src/third_party/ + / master / WebKit / Source / core / css / RemoteFontFaceSource.cpp＃74

I noticed this info log began to appear in Google Chrome Dev (Version 55.0.2883.18 dev) and I can't imagine why.

Slow network is detected. Fallback font will be used while loading: http://font-path.extension`

It appears on all websites that use font-face, even on local pages and Chrome extensions.

解决方案

This means the network is slow, and Chrome is replacing a web font (loaded with a @font-face rule) with a local fallback.

By default, the text rendered with a web font is invisible until the font is downloaded ("flash of invisible text"). With this change, the user on a slow network could start reading right when the content is loaded instead of looking into the empty page for several seconds.

• Related Chrome issue: https://bugs.chromium.org/p/chromium/issues/detail?id=578029. (A change enabling this behavior for 3G connections landed in September; this should be the reason you got the message.)
• Related source code: https://chromium.googlesource.com/chromium/src/third_party/+/master/WebKit/Source/core/css/RemoteFontFaceSource.cpp#74

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