Pages with multiple instances on CKEditor 5 are unnecessary slow

Problem/Motivation

We have nodes with paragraphs which contain ckeditor 5 instances.
Now i know i could load the paragraphs in a closed state but this is not what we're doing.

We're currently optimizing the author performance and benchmark the application with Blackfire and saw that a lot of code is executed for each instance of Ckeditor which i think we should be able to cache for each text editor format?

See the attachments of the timeline and the zoom into the getAttachments functions which i think we should be able to statically cache for each text editor format?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet