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When WordPress includes Gutenberg by default, will WordPress sites suffer from slower page loading times?

While it’s easy to test on a clean install, other factors, such as themes and plugins can have different impacts when working with Gutenberg installed.

Are there any publicly available metrics showing the effect Gutenberg has on x amount of tested sites and how will it differ when part of the the core rather than a plugin as it is currently?

When part of the core, can it be entirely deleted if not required to keep a WordPress installation lighter and cleaner?

  • I have noticed that administration is significantly slower, but I couldn't find a way to simply delete it so I installed a plugin which reverts old editor – Ivan Topić Jan 15 at 23:57
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This is a rule of thumb I learned long time ago, in a totally different field of software development - "Every new release will slow the features affected by it by 10%"

Of course that was in the days when there were years between release and the figure of 10% was probably pulled straight from that person's ***, but the underlying truth remains the same. You can not have more feature without hurting performance in some way.

So it should be trivial to claim that page generation with gutenberg will be slower as with addition to parsing shortcodes it will also need to introduce parsing its own comment markers.

The question that it is impossible to answer is by how much slower it will be. Most likely when it will be merged into core the answer will be "insignificant way" and (as always with wordpress sites) will depend more on your theme and plugins. In theory if gutenberg will enable you to remove some plugins, you might even gain performance.

(not even going here into caching as if you have a code page caching scheme, the difference in actual performance as a visitor sees it should be zero)

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    This is more of an answer to the concrete question in the tile than about the impact on all the possible permutations that are mentioned in the text – Mark Kaplun Aug 26 '18 at 6:38
  • I think what you said is a better way of looking at it. When you way up the slight and expected decrease in speed, then compear that to the increase of not having to have other plugins, the formula should be a positive one. Thanks for the good answer! – Invariant Change Aug 26 '18 at 6:41

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