iPhone X is incredibly slow at deleting characters in a textarea, it's shocking!

Deleting characters in a textarea on an HTML page with more than a few thousand characters is incredibly slow on an iPhone X device.

STEPS: 1. Visit https://missiveapp.com/iphone_x_test_case with an iPhone X 2. Focus the textarea 3. Touch the backspace key to delete characters

Boom! The iPhone X UI will hang for a few seconds! every time the word suggestion bubble appears.

This slowness only affects iPhone X, other models will delete characters with no sluggishness.

I post this here to raise awareness at Apple... it has been the case for the last 6 months.