greg2213

Re: “Please answer the questions in this issue on GitHub as detailed as possible.”

From GitHub:

Could you please answer the following questions?

Does the problem occur on every edit page of the same post type?
Yes, and it happens in both FF and Chrome.
If not, it might be something specific in the content that is “causing” the slowdown. Please note:
Length of the content: Quite long, several pages. Oh, found your word count. 4975 words.
If there are a lot of shortcodes in use. None
Use of images, links. Many links, a few images.
Use of other fields than the content field (for example excerpt or featured image). Excerpt field, no others.
Language in which the content is written. English
Does the problem also occur on edit pages of other post types? Yes.
Does the problem occur immediately after the page is loaded or does the page become slower over time? Immediate.
Does the problem only occur when editing specific fields on the page? No, occurs upon loading page.
Does the problem also occur when Yoast SEO is the only plugin active? Haven’t tried that, but it goes away completely when Yoast is deactivated.

Note: There was a minor update to Yoast today, it did nothing to fix the issue. Removing the focus keyword helps greatly. There’s still lag, but the editor is usable.