Problem: I am using Query Monitor to investigate my site's performance. It seems like the wpcf_image_is_attachment function is causing a bottleneck in query performance on my site. What are the implications of the option "add resized images to library"? In general do you have better performance when the option is checked?
Solution:
In general, you will have better performance with "add resized images to library" active because after the resized image has been rendered once it's saved to the library for future use. The server does not need to calculate and generate a resized image on each page load - it stores a reference to the image in your database and loads the resized image from the uploads folder. This creates an image attachment link in the database, so if you add 10 resized images to each post your database queries of image attachments will be incrementally slower as it needs to sort through more records.
When testing performance, we try to ensure that no single query takes longer than 0.5ms. If you have any single query that takes longer than 0.5ms, then we should try to investigate that query.
We document known issues and their solutions in Toolset errata. Save time by checking there first and seeing if what you are facing is a known issue. This list is kept short. We do our best to resolve all known issues with every release of Toolset plugins.
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