Load time can be improved in the Admin for WYSIWYG editor fields using delayed or interaction triggered loading via a checkbox when using the Classic WYSIWYG Editor field
TinyMCE will not be initialised until field is clicked.
ACF field speed can be also be improved with local json
Additionally you may want to explore using Transient caching:
Hope this information helps your site performance.
Thanks elliot > that appear to have done the trick… error warnings have disappeared > we will keep you updated as testing continues
Three sites updated with the new local.php file, and tested – all error warnings have disappeared and fields are returning correct data
## Update 5.5.7
Three development sites updated to ACF Pro 5.5.7
Two standard sites
All sites are working as expected
We have opened a ticket for this issue.
Currently trying to provide access for the ACF support team to our development servers.
Can confirm that the error occurs with a new WP installation:
Twenty Seventeen Theme
Clean install of ACF Pro > updated to 5.5.6
Error only appears to occur for us when Fields are exported as Php and included via PHP
Fields are also being displayed on an Options Page
Interesting to note, the accepted answer works just as well in a ‘must use’ (MU) plugin function called on ‘init’. Only mention this as it is a nice way to share the fields across subsites that use different themes.
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