ckeditor / ckeditor5 / 908a3f94-fa21-4b3f-a9d9-765625661dea

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Merge pull request #17725 from ckeditor/improve-performance-in-placeholder-2

Other (engine): Improve performance of the placeholders.

Other (image): Attribute `loading="lazy"` will be automatically added in editing view to images with `height` and `width` attributes set to improve loading performance.

Tests: Added new `ghs` manual performance test.

MINOR BREAKING CHANGE (image): Starting from this release, images that have `height` and `width` attributes set will automatically receive `loading="lazy"` attribute in the editing area. This happens only for the content loaded into the editor, the data output produced by the editor remains the same. The reason for this change is to improve user experience in documents that may contain hundreds of images.

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