A colleague reported that working on the table block with 24 columns and 24 rows was a painful experience. I tried it and quickly reduced the number of columns to 12.
Having seen some strange messages in the Chrome console I deactivated WordPress-SEO to see if it sped up at all. I didn’t get the
[Violation] messages from WordPress-SEO but still got `[Violation] ‘focus’ handler took 336ms` or `[Violation] ‘click’ handler took 233ms.` After reactivating the messages no longer appeared.