Table with a dozen columns

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.

C1C2C3C4C5C6C7C8C9C10C11C12
123456789101112
2.12.22.32.42.52.62.72.82.92.102.112.12
3.13.23.33.43.53.63.73.83.93.103.113.12
4.14.24.34.44.54.64.74.84.94.104.114.12
5.15.25.35.45.55.65.75.85.95.105.115.12
6.16.26.36.46.56.66.76.86.96.106.116.12

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.