Editing Richtext that is very long (50 000+ words) results in a very laggy experience (big delays) and high CPU loads on typing/changing the text.

Steps to reproduce
1. Clean installation of Ez Platform 2.5
2. Create a new Content Type with only RichText Field.
3. Create a Content of previously created Content Type. In Richtext field paste 10 times 10 000 words generated on https://www.lipsum.com
4. Save content.
5. Edit content.
6. Start typing in the middle of the wall of text.

Result
Big delay when typing.