More details of Google Chrome’s never slow mode appears online

Chrome on Windows PC

Google Chrome is the most popular web browser for all platforms
because it’s fast and reliable. Google is constantly working on
new ways to reduce resources consumption and improve web
browsing performance.

Recently, it was discovered that Google is internally testing a
Never Slow Mode (NSM) which is another feature designed to
improve performance while delivering reliable browsing

The Never Slow Mode will obviously work on all platforms,
including Microsoft’s Windows 10. The Chromium Gerrit
commit revealed that Never Slow mode is supposed
to block large scripts and also set budgets for contents
like fonts, images and scripts.

This would mean that Google will only allow faster scripts to
load which will apparently improve webpage load time on all
internet connections.

Today, we discovered a Github post from
Google engineers with all technical details of the Never Slow
Mode functionality.

Google says Never-Slow Mode (“NSM”) is a mode that
webpages can choose to opt-into via the HTTP header. If a
website opts-into NSM, Google Chrome will
impose per-interaction resource limits and this would
improve the webpage loading speed.

What’s more interesting is that NSM could make it easier for
sites to guarantee ‘speed’ to their customers.

As shown in the screenshots below, Google Chrome will also
display an icon to users to indicate when they are in the fast

Never Slow Mode

Never Slow Mode (NSM) acts as a Feature Policy and
it disables certain web platform features or set a budget
for resources with the intention to improve the site loading

  • JavaScript and WASM modules are limited to 50
    KiB per-resource and a total per-interaction limit
    of 500 KiB within a document.
  • CSS stylesheets are limited to 100
    KiB per-resource and a total per-interaction limit
    of 200 KiB.
  • Web Fonts are limited to 100 KiB per-resource and
    a total per-interaction limit of 100 KiB.
  • Images are limited to 1024 KiB (1 MiB)
    per-resource and a total per-interaction limit of 2048
    KiB (2 MiB) within a document.

Google’s Never Slow Mode could be a huge step to improve the
web browsing experience. From the user’s point of view, it is
designed to drastically improve the webpage load time, but it
is up to the webpages to use the feature and it won’t be forced
on anyone.

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