This issue is fixed by a technical task in Master and is therefore documenting the backport of that fix to 7.2 to fix the issue seen.
1. Setup an instance of Liferay.
2. Create a page and add a large number (at least 10+) fragments with text on them to the page.
3. Publish the page. Open your browser console.
4. Edit the page. Edit the text in one of these fragments and repeatedly attempt to edit the fragment by clicking on it/clicking away from it.
Expected Result: No exceptions occur. You are able to edit the fragment's text.
Actual Result: The editor freezes. The following exception appears in the console:
This is a really flaky performance error and requires a large number of fragments to be seen. So far we've required a client's setup to reproduce it since they have a combination of large enough/complex enough fragments that the error is consistently reproducible.
Not Reproduced in: