Why does this "Slow network detected..." log appear in Chrome?

font-face, google-chrome

Solution

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

Problem

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.

Original source

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