Disable Gutenberg does not effect load time, if anything it will increase post or page load times in wp-admin.
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This reply was modified 7 years, 5 months ago by
Luke Cavanagh. Reason: clarify wording
Classic Editor new post
100 requests
Load 1.58 seconds
Gutenberg block editor new post
99 requests
Load 1.85 seconds
What Luke said. Plus I would add that Gut/Block Editor adds 5MB of JavaScript to the Edit Post screen, so Disable Gutenberg is gonna help with that. Also on the frontend, Gutenberg loads a fairly large CSS file, and Disable Gutenberg provides an option to remove that as well. So bottom line is Disable Gutenberg helps improve site performance.
Thanks Luke and Jeff for the information provided. Much appreciated!